Re: 30W or more for jamming?
Only my opinion, but I would stay far away from the MG series marshalls.
For the almost 300 bills you slap down for that, you could get a much better amp.
i.e. Line6, Roland, Kustom, Behringer, just to name a few. To narrow it down farther , Id need to know what style of music you'd be playing.
I cant comment on the fender, but my gut feeling tells me youd be better off with it than the marshall.