well i have rail m1 and thunder m1 but each weapon has its own benefits

First of all lets not forget that what i am writing here is just advise ! You do not have to do what i say . Okay lets get started about Railgun. Railgun has much more damage then thunder ( both of them same upgrade) .But railgun"s reaload spped is low so you may have trouble with isida and other close range weapons or if in open space.But a simple shot of railgun on a weak tank could take him out ! If your a fan of Moon silence railgun will get you in trouble so think twice before taking a shot .You may flip and get your tracks lying upside down in an important situation. Now continuing with thunder Thunder's damage is much more less than the railgun"s but will provide you with quick firing wich will make your opponents hide. Not to forget that firing thunder shots next to a tank or at a small group will provide damage. But be aware from close range guns like isida and firebird they may get close to you and you will be forced to fire and that will damage your tanks Thanks for reading you where with jackass20000 always ready to battle ;)