I mainly use Procreate ($10) for both my photomanipulations and illustrations. Sometimes I’ll do finishing touches in Photoshop and/or Lightroom (on the Creative Cloud plan, about $20/mo). For vector-based projects, I use Vectornator ($free.99).
When I first started, I used Autodesk Sketchbook ($free.99). I still highly recommend it (especially if you’re on a budget and/or first starting out), but Procreate recently added some powerful features that have won me over.