I would go with the fx section in the MPC. Get to know theyr sounds and capabilities and then get something with a difrent sound colour and posibilities for your rack.
-- Niemandsland
Initially this makes a lot of sense..
really the best reasons to go for in rack effects are - it must be in the rack (portability or OCD issues) or you must have mdulation via CV (woozy modulated reverbs and delays can sound interesting) - or because a specific effect is only available in eurorack format (probably not that many) or you want to experiment with unusual signal paths (effects early in the signal chain before, for example, filtering or waveshaping/folding etc)
but all those can come later...
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities