Thanks alot for the quick response time

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This is kind of off topic but I might as well ask.....
I have a Diablo Mongoose with eyes and LCD all stock....and a friend gave me a Tippmann with RT, upgraded barrell, and double trigger. Now I really don't play that much maybe once every other weekend. Which gun should I be using. I was thinking I could use the Tippmann and I could buy upgrades for it as I get money for it and so on.
If you could recommend which one I should use and any other upgrades that would be great.
Thanks in advance.