OP fwiw i went from SE to Ultra 1 then to Ultra2 then to S10 last october. my thinking was S10 is lighter and more suited for most occasions and it was but mostly what i missed was the battery life upto 4 days with no fitness activities 3 days with routine fitness activities , the appearance the feel of the durability my ultra2 i had since October 2023 not a mark on it and still it had 100% battery life.
3 months of using S10 daily i found myself charging 1st thing in morning and before sleep as i use it for vitals monitoring overnight sleeping with Ultra 2 battery charging was less frequent hence after a year it still had 100% battery health .
Durability of the S10 was not the same i am a clumsy ol git and it had a few marks after 2 months as where the ultra 2 had none hence the durability of the ultra 2 is significantly more in my use case so I ended up giving the S10 too my wife as her S7 battery health was depleting rapidly and struggling to last a full day in fact probably only lasting 12 hours as she is quite active using it for calls and endless whatsapp notifications. im back on the ultra 2 and do if possible go to a apple store find a enthusiastic sales rep who will help you decide spending some time trying the ultra 2 with different straps , getting the right suitable style of strap and size is the key to eradicating the oversized watch thought the weight or size after a week its not noticeable or disturbing . good luck in deciding and as for waiting for every september release by the following january the speculation of newer versions arise so you will never keep up but fwiw the ultra 2 is probably one of their least disposable devices..