OK, first of all: "Get a good warranty"? Warranty extensions, "service-plus" plans, and anything else of that ilk is a scam. It's nothing but profit for the store. The same guys service your amp whether it's in warranty or not, and it dumps an excess workload on an already hyperextended repair bench.
I speak from experience -- I was a service desk manager, for a local branch of an infamous electronics chain (RIP, thank you Lord). I was the whine-catcher when things went wrong for the customer. The doofus piece usually had wave-soldered surface-mount circuit boards, so our guys couldn't do anything with 'em. Most of the time, we handed out store credits and told fussy baby to pick out something new... which is basically a retail version of what we did with the defecive product, return it for credit on a fresh unit.
Second, Asian-made stuff is all over the place. Perhaps QC issues abound for a particular model, but it's more likely a design flaw than a manufacturing problem. OK, rant's over; boy, that felt good.
Having said that, I'd go for the Roland. Hulk says, "Tubes glass... glass break."