262c/c2/d is the closest match for S650, 242 is smaller frame ROC etc.
every D series machine from 236D up through 262D has a 73hp Tier4F Kubota 3.3L. The C and C2 262 machines have a 3.4L Mitsubishi with no emissions controls. The C was rated at 82hp and the C2 was derated to 74hp to drop it into the 50-74hp emissions category.
We've had a 262C, 262C2 and now 262D. They keep getting better. Almost nothing changed from C to C2, the control response was better but it may have simply been newer software or a better calibration. If you are not used to EH controls you may want to make sure you'll like them, if the Bobcat has the SJC controls then the Cat wont seem bad at all, but if it has manual controls or ACS controls and you are used to those, you may like it over the EH. EH is not hard to get used to, just not always as in tune with what you tell it to do, it has its moments where it wants to be laggy.
The 262C will be pretty easy to work on and maintain. The Cab on them is very nice and all one piece so it stays tight and clean. The cooling system on the Cat's stays cleaner especially if you deal with any sort of chaff, easier to clean out too except for the A/C condensor on the C/C2's, those kinda suck.
Probably can't go wrong with either machine really though, can you drive both around a bit to get more of an opinion?