I know a lot of people, especially enthusiasts on forums like this, are stuck in the “later is greater” mentality , especially with an Apple device that receives a yearly refresh. But advice to an Apple watch newbie - it is a watch first and foremost. The yearly upgrades have added some new sensors and they sure keep getting bigger and bigger. But the apps and actual functionality of the watch will be exactly the same (and don’t expect too much out of apps, there’s very very little innovation happening there, because remember…it’s a watch)
Anything at or above Series 4 is absolutely the exact same experience , and honestly series 3 does just fine too … even though it takes half an hour to power on. Buying brand new top of the line? Very very expensive…
If you absolutely must have always -on display you have to go with Series 5, 6, or 7. My first watch was a 5 because I absolutely NEEDED that always on display and would not buy an Apple Watch without one. But after about a year I realized I can take or leave it. So I guess if you need to buy brand new and you want aluminum I’d recommend an SE. My two cents if I were buying my first watch. Whatever you choose , congrats and enjoy!