Hi Brock,
The connectivity is well worth the extra money in my opinion. I know some people do genuinely love the whole process of sitting in front of their computer and uploading their rides, it’s part of their post ride ritual; on the other hand I greatly appreciate that it all happens automatically while I’m packing the bikes up and herding the kids back in to the car. On the odd occasion when I’m riding with mates and have time for a coffee afterwards it’s nice to be able to look at the ride and compare segments while we’re sat in the café.
The 25 has BTLE (Blue Tooth Low Energy) and ANT+ so is about as future proof and well connected as you can make it. And I f you have an interest in training you’ll want an HRM strap at some point and possibly speed and cadence sensors which the 20 just won’t talk too.
Hope this helps,
Rupert