I've been using the Gulp Maggots this year, and they've worked really well so far. I've been catching about the same amount as I did with spikes, as far as I can tell ... and with bait prices the way they are the Gulp bait isn't really any more expensive than the real thing. As an added bonus, they seem to last longer on the hook.
I haven't used the minnows, but seeing as the maggots are as good as they are I'd be confident recommending the Gulp bait in general.