Yea, I know they're totally different, and I'm not really worried about the Bar...I was just curious if one test was generally known to be more difficult than the other.
Yes, the bar exam is monumentally harder/more challenging than the LSAT by far, assuming you are taking the bar in a state with potential jobs for lawyers (a few states where nothing happens and nobody wants to live don't even have a bar exam).
The CA bar exam (and others) is a 3 day test, all day each day. Just comparing them by allotted testing time, taking the CA bar is equivalent to taking 6 full 5 section timed LSAT's in 3 days straight, 2 per day. On top of the mental and physical endurance you need to even be able to make it through the whole test, unlike the LSAT, you actually have to know a lot of detailed stuff that you have to apply to facts and write a bunch of analysis about. Of course there is the middle day where you get the MBE which is a 200 question multiple choice test from hell.
The LSAT is a walk in the park compared to the bar exam. There is a reason they station Ambulances outside the big conference centers when a bar exam is being given there.
On the bright side, fortunately all you have to do is PASS the bar exam, you don't get a score and get ranked against others, you just get PASS or NO PASS, so that LSAT type of pressure isn't there.