Currently have S7. Considering the switch to Garmin/Coros or upgrading to Ultra. Need some advice!

Hey all, currently have the series 7 and I’m down to 70% battery life. I primarily run, lift, and short hike for exercise. I do have a pretty active lifestyle between being a PE teacher, camping/outdoors, and general dad activities. I’m really considering the switch to Garmin or Coros just for something different. But I’m also interested in the Ultra as well. I don’t really care about call/texting/Apple Pay from the watch. That stuff isn’t important to me, but I do want something that is durable and can last on a couple day camping trip without being charged. I do run trails occasionally but nothing longer than 10 miles. Which direction should I go? If it is the ultra, should I buy a 2 on discount now? Or wait for the 3 this fall when the 4 comes out? Thanks for reading this.