Quality of soundbar vs. quality of bookshelf speakers is going to be a factor. But where we don't shoot one down to prop up the other, the general hierarchy for best theater sound is IMO:
- Traditional Receiver plus wired "dumb" speakers, placed all around the main seating position, including overhead (ceiling) if one wants true ATMOS
- Traditional plus wired "dumb" speakers minus the overhead speakers for highest quality surround sound that is short of ATMOS
- Very high quality soundbars that have some way to work with surround speakers and a sub too (one example of many: Sonos Ultimate Immersive with Arc + twin 300s + Sub)
- Cheaper soundbars that can still work with surround speakers and sub
- Stereo speakers including things like Apple HPs
- Mono speaker including cheap soundbars with no surround or sub capability
- TV built-in speakers
Core assumption in this list is spending the money to buy quality vs. cheaping out.
I think soundbars have become popular because they are:
- generally/relatively cheap,
- definitely sound better than #7,
- involve minimal effort to install them (as little as one cable),
- people notice their friends have one and assume that is better than (them) not having one, and
- the marketing messages claim "ATMOS" (when NONE of them- at any price- deliver true ATMOS). If "I can get ATMOS for $200, why should I spend $2000?" Consider "if I can text, call and internet browse with a $200 Android phone, why pay up for iPhone?" and the mainstream answers you start conjuring will generally apply here too.
Since anything will sound better than the default (#7), anything anyone chooses to try is a huge improvement. They will then gush about how much better it sounds, which then makes those hearing the gush think that whatever they chose is a great option for them too. Some go with it, it sounds better than their default (#7) too and they gush to their friends. What is missed in most cases is how much BETTER it can sound if they step on up above some cheap option they pit against the worst option. Most don't fundamentally know that because their point of reference is only how it used to sound (#7) vs. how much better it sounds now. This makes it easy for misinformation to spread with up to great passion for less-than-the-best possibilities.
Whenever it is at all possible, anyone seeking best possible sound should go #1 or #2. As one steps down the list, audio quality compromises are being made.
Now again, if we couch arguments of "great" #3 vs. "cheap" #1 or the more ambiguous "a high quality this vs. a low quality that," then about anything on the list can move up or down vs. any other thing.
BUT, if anyone is pursuing
maximum quality of home theater sound, there's no getting it from
ANY solution that has all speakers "up front" as is the case with #5-#7. Step into any professional cinema before the lights go down and take a good look around. NONE of them will have any kind of speakers only down front. Why not? Because there's no way to deliver the audio experience vs. the more expensive setups they
DO use that involves speakers placed all around the viewer.
Similarly, there is no professional theater leaning on only a soundbar-based setup. Again why when it would cost much less than what they DO use? Same answer.
Extrapolate BOTH examples to a home theater if the goal is great audio quality.
If the theater room is not wide, soundbar options in #3 and #4 can sound pretty good or even great. But as room size grows, stereo separation is limited to the width of the bar. Yes, there IS some technical trickery possible, but that's the same as the (marketing) trickery that will spin soundbars as being both ATMOS and surround sound. Your ears will absolutely notice if you compare such options to other setups where there is
actually speakers "back there" and "up there."
My advice to anyone interested is always the same: strive for #1. Work through every possible option to try to get yourself a #1 system, even if you have to build it over time.
If #1 is just impossible, similarly strive for the easier #2 (because you don't have to get speaker wire into the ceiling).
If you just can't do it, consider allocating some money to bring in some pros to figure out how to install it. They won't cost that much and this is a one-time expense that will then serve you for up to however long you live in that home (and then most of the same system will move to the next home with you when you move). You call in an electrician to solve electrical issues. You call in a plumber to solve plumbing problems. Call in A/V installers to solve traditional home theater issues.
Below #2, barely consider #4 and below because it's a sizable compromise when you jam left, center & right into a single container that is only a few feet wide. So go quality (#3) if it
has to be a soundbar. The best rated ones will generally be pricey (like Apple tech) but there's a (most fundamental) reason for that. If there's ever a "you get what you pay for" chunk of tech, it's this one. Unlike iPhones, Macs, iPads, etc... get this right and you can potentially enjoy the very same tech purchase for up to the rest of your life... not just a few years and then feel the need to replace it... over and over again. Since this can be a decade+ (use) purchase,
BOTH choose wisely and spend accordingly.
From #4 to #7, you are basically opting for lower quality audio and/or other compromises in almost all cases. Consider #4+ when theater sound quality is not your priority. If cost dominates your thinking, just about anything will be (a lot) better than #7.
I hope this is helpful to all who discover this zombie thread recently revived by a few new posts. OP has likely long-since made their decision years ago.