Well, you'll find some people who will say a 7-footer is tougher for 8-Ball than a 9-footer (if the tables are similar other than their size) because of more congestion on the smaller table. [Perhaps you think the same logic applies for 14.1 on an 8-footer vs. a 9-footer.]
Well, I have zero experience or data for 14.1 on 8-footers. But I do have data for 8-Ball on 7-footers and 9-footers.
Here's a comparison I posted in 2015 showing that 8-Ball produced similar statistics on 7-footers and 9-footers for top players in some big events in 2014 and 2015: https://forums.azbilliards.com/showpost.php?p=5255675&postcount=3
And with the change from 7-footers to 9-footers in 2017 for the US Open 8-Ball Championship, I was able to compare stats for that event for the 2 years before the change (7-footers) versus the 2 years after the change (9-footers). That comparison was still close for some measures but leaned toward the 9-footers being a bit tougher overall: https://forums.azbilliards.com/showpost.php?p=6191685&postcount=9
As for 14.1 on 8-footers vs. 9-footers, until some experts who have played a lot of 14.1 on both sizes of tables (and I don't imagine we'll find many top pros who have ever played much 14.1 on 8-footers) say otherwise, I'm willing to believe what John Schmidt has to say on the topic. Post #71 above quotes him from a few weeks ago on Facebook, and here is what he posted on AzB in 2009:
- "for the record i think 14.1 on the bartable is easier than 9ft.
you can reach allbreakballs,combos and shots are a joke etc.
yes its more confined space but with the cueball control ive learned from 14.1 thats the last thing im worried about.
for the record the easiest table to play 14.1 is a 4x8 .ive played on them all and its the easiest no doubt. enough room to play but still easier on shotmaking,reaching,combos than 9ft."