I run both on different bikes – two of each – and they're both decent hubs. Stuff to be aware of is that the Pro 2 is fearsomely noisy when free-wheeling which you'll either like or not, the 240S is more restrained, but still quite pleasant to listen to.
The Pro 2 freehub bearings seem to die relatively quickly compared to the
DT SWiss bearings, don't know why, but they just do. The freehub body on the Hopes marks up very easily, beware of using it with a singlespeed converter if that's a possibility.
Spares for both are readily available ime. The DT Swiss tool is a pita if you do your own servicing, I bought one ages ago when it was more like 25 quid and servicing them has been fine. If you don't do your own servicing, that's not really a factor. I prefer the DT Swiss at a sort of gut level, though I do know people who've broken them. Then again I know folk who've broken Pro 2s as well.
I guess it comes down to weight and ease of servicing really. Or just gut feeling…