So here is my take on this. I have used both Boss and Digitech pedals and multi's. Pedal to Pedal I prefer Boss, just better built boxes. But when it comes to Multi's, I believe DigiTech owns the tech side of market. Agreeably a multi pedal can be difficult to use if you are a technophobe or are looking for that plug and play ability of individual pedals. But, for me multi's and Digitechs just make more sense overall. Don't get me wrong, I like simple, Delay Chorus Distortion into an amp is just fine, but sometimes I want to play around to see how far down the tone hole I can take it.
I had a RP355 and BP255 digital processors in my rig awhile back, and that was all I ever used. Being a techy, and having played with computers since I was in Jr High, I could easily program these pedals from my tower computer. I would imagine, using the their software, I would have been able to set the pedals up to do a full gig without having to bounce between this distortion or that chorus depending on the song, just 1 2 3 4 through the set. with a laptop, I could go full portable, and make changes to a patch on the fly. A good portion of the effects models in the RP series multi's are actually based on Boss stomp boxes, so they know where to find the good tones. They also have a wide selection of amp and cabinet combinations (as does Boss) which is pretty cool if you can't afford to own all those amps and cabs. (no Archon's though
).
Another reason I like the multi's is the size. If I had a pedal board (and amps) as contained in the multi, I would need to put an addition on the house, and take out a second mortgage. So, they make economic sense as well. I realize the RP is not "pro" gear, but for a rank amateur like me, It makes me feel like a pro. ( I guess that's why they sell it to people like me.)