I’m deciding between The Grenade Launcher, Magma Launcher, and Gas. What should I get?

I know gas launcher is the best out of all of those but it is the most expensive. The straight up grenade launcher seem weak but I never see it used. Magma I heard is good but I just came back to era and I know pretty little of how to get plasma coins.

Bolt Blaster seems pretty good and could work as a launcher but I don’t know. I haven’t been active in era for years so I really need a second opinion.