Just get the ultra. I go on 6 mile run on Saturday morning listening to music and dont need to charge until Monday morning. It's been pretty great.Poor battery life keeps me uninterested. I was hoping for a new ultra, but as that one didn't materialize I'll just keep waiting with my series 5 watch. Faster charging is nice, having to charge twice a day is not. I'll buy a new one when I can rely on the watch to comfortably hold a charge for a full day and night EVEN IF I ACTUALLY USE IT.
I thought I'd be ok with the battery life and charging speeds of my current one, but in reality it's a nightmare. Half the time the watch is out of power when I need it. So these lukewarm updates can be bought by those who want a marginal update. I'll wait for something more concrete.