Here's the thing with the big three multi-fx companies:
BOSS does "most" things "better" than the others, but their distortion is almost universally hated.
DIGITECH does distortion WAY "better" than BOSS, but their modulation effects are atrocious.
Line 6 does almost everything pretty well. Very usable Distortion types, pretty good modulation effects, really nice verbs and delays, and their amp/cab sims are mostly excellent.
However:
Line 6 build quality is unforgivable given the price point.
DIGITECH has slid slowly under the RADAR and further out of the picture over the past several years. Their more recent stuff has been very cheaply built and hardly gig-worthy because they're too fragile. My old RP-3 was the last of the "bulletproof" made of steel by men... Brawny men...
BOSS products are still built like tanks regardless of country of origin. You are rarely going to have to worry about a BOSS unit shitting the bed unexpectedly.
When you get into the Kempler, AXE FX or even some TC stuff, of course they're well built and usually have great sounds, but they're a whole other category due to the big step up in cost.
So, if you're on a budget... Buy a BOSS and a dirt pedal that suits you. All set. Wham bam thank you mam!