Well, in that case, a laptop trumps them all...

Sound quality FAR in excess of ANY arranger out there, longer samples, more flexible recording possibilities, live-loop tools far better than any arranger, you name it... And probably much less expensive (compared to a TOTL arranger with the tools you say you want - sampler, etc.).

I mean, if we are going to pick a tool to be creative on, why not the MOST flexible, good sounding tool available?