It really does depend on your game as to what table you will find "easier" to play on as far as 8 ball goes.
Given that player A and player B both pot 90%+ of balls they attempt it would come down to positional play, decision making/ planning and their ability to break out clusters (and I don't care what anyone says, clusters are way more common on a 7' table
).
Positional play becomes more difficult, for me anyway, on a smaller table because there is less margin for error generally and because of the number of balls in a smaller more confined space, your judgement of speed is crutial.
Breaking out clusters isn't an exact science and is very difficult to predict the outcome with any consistency. So the more clusters you have over the course of a match the lower your break and run percentage will be.
I find it far easier to plan a rack of 8 ball after the break on a 9' table usually because there is a better spread. Things are much clearer and even if your plan falls apart, you usually have enough space on the table to get back on track to fulfil your initial plan after 1 shot.
This is just my opinion though