I remember Jones making quite a few errors, but a large proportion of those seemed to consist of him slicing clearances into touch, which didn't hurt the team unduly (although I did **** me off on many occasions).Amazing his football generates so many different opinions.
I'd say Jones was far more error prone than Bobby.
If you look at the goals Bobby concedes however, an unusually large number seem to have been over his head, with him frantically backtracking and failing to save efforts from distance, mostly in front of the BB. Yes he has undoubtedly kept us in games this season, but I agree with Mr Moxey that really good sides don't tend to concede the type of goals that we do, and a lot of that IMO stems from not having a really dominant keeper.