Morning Keith
Best bet is to get a pair of each in hand, and see through your own eyes. I didn't manage to do that, and went for the 10x, and have no complaints. Now, they might not be as good at first and last as the 8x, but having not made the comparison, I don't know, so don't worry.
The 10x do suffer from wobble, but I always hold them supported on my sticks, so again, no complaints from here. The RFs are a lump heavier than non-RF, so be warned, but all in all, stonkingly good binos and the RF is superb
Cheers
iain