the cost of building a pedal board from scratch mounts up very very quickly. I could only see it being a sensible option if you already had some pedals, and/or theres certain pedals you need that the multiFX just dont cover. Otherwise, a multiFX is the obvious choice in my view!
The zoom stuff is greaet. I've gigged it for years although latterly I'vemoved onto a HX stomp. But, I've happily used the ms60b for the occasional gig recently when ive loaned my stomp to another band member for the set. I also dont use alot of effects, so thems60b does a grand job. It is limited though obviously.
I'd 100% recommend the b3 and b3m, or even the old b9.1ut if you can find one cheap! gigged them all over the years with zero issues! the Latter has a weird 2 way control pedal that you can get quite creative with!