Each weapon has its pros and cons, some are good for short-medium range combat, while others come in handy in long-range combat.
Check the pros and cons of all the guns here.
It is true that some turrets and hulls are stronger overall, (i.e. Rico, Rail, Vulcan, etc.), however, they are more expensive and require higher ranks. Don't just think that if you don't have Rail you won't be pro, because for me Rail sucks. Each works for some and not so, based on your playing style. No matter which combo you pick, stick to it and dedicate to it well, and you will be pro with any of them. I used to think that Thunder was awful when I played it, but now against it, I find it OP. Not everything is as it seems...
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