Feel identical in size but lighter weight with chamfered edges makes it a bit grippier. I find they're both slippery still but the 6p has a small advantage.
The Edge+ is IMO the best looking device this year and my favorite from a hardware perspective. I'm just not personally a fan of the UX/UI and place a higher lever of importance on smoothness and performance over features. Obviously this is a strength of iOS but I prefer the UI on Android as well as the Google Ecosystem so the Nexus devices are a good fit for me.
Samsung devices have great features but require a learning curve which can be off putting for some, but can't live without for others. Stock Android is more intuitive due to its simplicity.
In the end, there are things we sacrifice in favor of others but you really have to try to see for yourself. Google has an extended return policy atm so its a good time to try it out.
I concur. Personally speaking.
Size wise they are all much of a muchness. But from an aesthetics PoV the Edge + has a greater 'wow' factor.
That being said I too value performance and consistency over aesthetic, likewise my terrible Samsung after support with the original Edge has also detracted a lot of my trust & faith in Samsung.
When we're paying ridiculous money for handsets these days after support has become a big factor for me, and it's where Samsung (at least here in Ireland) really fall flat on their face. Offering a more frustrating after sales experience than OnePlus takes some doing, but they achieved it.
As for the 6P & 6S+ they too are much of a muchness size wise and even weight wise. Both need cases, as without they are both very slippery (accidents waiting to happen).
Performance has been rock solid on both, neither experiencing any warmth / heat when under heavy load compared to the likes of the Moto X Style or M9
Battery life is good on both but the S6+ is better here, but still get a full day with the 6P
Speakers on the 6P are better being stereo front facing.
Reception and cellular quality are near identical on Vodafone here.
Either is a good choice, but if saving a few $$ is important then the 6P clearly is cheaper, however the 6S+ will hold its resale value longer.
That being said the Edge + does have overall a better screen/display and camera - so bare that in mind if you do switch that this is a concession you are choosing for a more consistent software experience, though also realise a 'nexus' device can be very barebones on the software side if you are used to more options in your android launcher.
As stated above, why not simply try it out and return if you don't find it suitable. Googles return policy is very lenient in this regard.
