Possibly? If you were coming to the USA for tournaments, it would be useful to get NTSC, but Europe only uses PAL if I remember correctly so it wouldn't be all that beneficial to you unless you were traveling out of the country for extended periods of time. 20XX is exclusive to 1.02, so it might not be a bad idea of getting an ISO of it sometime (but you wouldn't be able to play a NTSC disc on a PAL system).
How so?
This has been tried numerous times, but the conclusion has always been to go back and try to finish the community tier list started by Sveet in 2013. I'd be up for starting discussion, but in my experience, it's always died before getting to page 3.
Anyways, I feel like Marth definitely shouldn't be above Falco in NTSC. I think the thing that put Falco at a disadvantage in PAL is half of his Dair animation actually sends the opponent up and out instead of spiking them, but I feel like Falco has a lot of stronger MUs throughout the cast than Marth does. I also feel like Shiek should be higher than Marth, but that is more debatable.