I think the 235 estimates Vo2 max but the 225 doesn't and that's it. I'm sure I read that on the DC Rainmaker site when I was looking for a watch with a HR monitor so might be worth checking there.
If that's it I'll take the saving!
Read the DCr review of 235 again earlier so I'll read the 22 and use his comparison tool which is pretty good.
That was my thinking (although I still haven't actually got around to getting one yet...)
I find the smart notifications very useful for meetings when you don't want to look like you're on your phone to.
@5awyr started
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I think the 235 estimates Vo2 max but the 225 doesn't and that's it.
I'm sure I read that on the DC Rainmaker site when I was looking for a watch with a HR monitor so might be worth checking there.