Re. the above: Korg Arp Odyssey is lovely on leads from what I’ve heard. If you’re looking at Moog Subs, the Sub 37 is smooooth and sounds nice for sure, but for lairy, cutting FILTH, the Sub Phatty is where it’s at. And it’s half the price.
Buuut, for real soloing… You need a keyboard with more octaves.
In that respect, you could get an older Little Phatty and hook up any midi keyboard you like. But my top tip is a King Korg… You can get great lead tones out those - often overlooked for some reason, but they’re great for soloing (we use one several times a week on gigs with the Hip Hop House Band - aaand Corey Henry has often rocked one with Snarky Puppy!)
The last few weeks I’ve seen guys slay live solos on things as diverse as an Arturia Microbrute (Submotion Orchestra), and an OB-6 and Prophet 6 (Jamiroquai).
So really, almost anything can do it - it’s just all about dialling in your patches to find the sweet spots. Time with the instrument, programming it.