Can length and a couple of other Qs

[KiZ]

Hi all. I had a look at the faq and searched the forum, but could not find an answer, so here we go;

How does can length affect a motor?

I am looking for a motor for my crt .5, and it seems the 3300kv 36x50mm medusa v2 is what I want (is that right?). How would the 60mm version differ? I guess it is simply more torque? Would that benefit me at all? I haven't decided whether I want an onroad racer or an off-road truck yet. I am using a MM esc on 3S.

And can someone confirm that the MR-036-050-3300V2-5 is the right motor? (I really would hate to order the wrong one!)

And finally... I know some people on here don't seem to like Maxamps very much, is there a reason for that? And if so, can anyone suggest a better brand?

Thanks
KiZ