Retopoflow vs TopoGun?

Hello!

I'm diving into manual retopology and need some advice. I already have Retopoflow 3, but I see that TopoGun is considered the industry standard.

For $150, I'm curious, should I start with Retopoflow and transition to TopoGun later as I progress? Or is it worth buying TopoGun right away? I'm not financially flexible at the moment, so I'd love some insight from those with experience!

Thanks in advance!