Slightly stoopid uses some active bass and use to use an Ibanez of some kind. Honestly IMO reggae is all about play style and groove. Don't get me wrong a lot of classic dub records it's a p or jazz but also I have friends who play reggae (stoners...) and they play nice but no matter the gear they sound like a punk band. Use flatwounds, look into brands of flats, you got let em get old or go with some that sound good, chromes I even thought worked well for me even with the brightness of them. (No matter what though, whatever you like is what matters, rounds or flats etc.) Play more near the bridge and neck, go slow or groove slow. Robbie used a hofner sometimes! If you want to choose one of those two, yes jazz but I think any bass for the most part can work IMO! Good luck dude!