Substance Painter is the best texture painting application today. It’s better than Blender texture painting.
That said, Substance is a commercial product. You get a free 30-day trial and can have an free educational license if you’re an active student or teacher. But beyond that you’ll have to pay the subscription fee. Please don’t entertain the temptation to pirate software.
This is where Blender is worth learning as an inferior texture painting application. But if you can afford substance, it’s the better app (right now) for sure.