In my honest opinion, most bar table players in my area wont gamble on the big table. I know this because they will play me even or with slight weight on bar table, but on big table they opt out.
Now, I know they can play on the big table, but they lose. My bar table game is ok, not my favorite, but I can play on them very well. But when I get on the big track with the same group of players the egde switches to my favor.
I learned to play on 4x8 with bigball, or slightly big ball, and on 9 footers, and have played lots of snooker tables (in the past). I believe that playing on the 9 footers make my shot making ability more accurate, because from what I have seen, a shorter stroke and angle seems to come with bar table play, that has to be changed to make shots on big tables. Which is where the bar table players seem to have their problems.
Now, this is just what I have seen locally. All recently, and I do pay attention, close attention.
I think that bar tables are harder, if your used to playing only 9 footers, but only playing tight shape and learning to play 1 rail shape alot, verses playing 2 and 3 rails shots on big table. I do not think that accurace is lost, just a different strategy, and position.
So, when bar table players get to the big table, they lack the cue ball control to ride the rails accurately and confidently, and they lack the stroke to make long shots under pressure, providing they are not short stops or pros who are used to playing on both tables.
So is the consensus then that it's tougher to play on a bar table.
Also, to address the comment about the size of the tables. To my knowledge a "bar" table is one that is 3.5x7 feet. It is the same scale as a 4.5x9 foot or a 4x8. I think that just about all billiard tables are twice as long as they are wide. Which of course brings up the pocket openings and distance as a factor.
For the person who brought snooker into the conversation, snooker tables play completely differently with the cloth, cushion profile and pocket facings being different. So I don't find that this is an apt comparison in this thread but it does have validity in the larger context of billiards in general.
I wanted to add something I forgot before about Buddy. In Rags to Rifleman he is said to have said that on the barbox you don't need to ever play for the side pockets. He said you can play most of your position for the four corners. So I guess in that sense it's easier to play on the barbox.
I guess numerically speaking there will never be an eight foot shot on a 7 foot table so in that sense there will be a lot more "difficult" shots on a 9 footer than on the 7 footer.
I still think though that a good player should be well rounded enough to be able to play great on either table but I can appreciate that some will be better or worse on the table they are used to.