AEG - If you want to be on the bandwagon, There are lots of Gun Docs who can fix it. Variation are too much to count. If you want to game all winter, this isn't the best choice simply because of battery issue.
PTW - Step up from AEG, these are more realistic, and cost alot more. The only problem is the motor, you get it mod and it should be good for rest of it's life. The Price is a big difference and PTW are only in M4/M16/Mk18 and MP5A4. (MP5 is discontinued series, yet the newest)
GBB -Most realistic airsoft you can get. These are what's best describe as the best simulation to firearm without high velocity rounds (as in lethal) Temperature operation is best above 10 degrees, some can run around 0 to 10. GBBR are not suited that low. The biggest down side is the magazine price is significantly higher than AEG/PTW ones. In addition, not much gun docs are available (though it's not hard to fix as they're all mechanical and you can easily figure it out. AEG has electric so it's a little harder)
Classic -The original airsoft gun. These one has everything GBB has to offer except a hoseline instead of gas in a magazine. The kicks are usually stronger because higher pressure can be used. The benefit is simply cool-down is barely noticiable (I tried using a Daytonagun AK in -20 with CO2, works fine without cool down. Gas consumption increase alot though) The benefit of cheap AEG mags in Escort/ Daytonagun are also found. In another words, a Classic is AEG and GBB combine except it has a hose line.
All up to you...
Personally I wouldn't go AEG, imho you need to know and how to fix your own gun (atleast basic to intermediate difficulty stuff)
only down side to Daytonagun and Escort is the availability. (There's two in classified right now, an AK and a M249)
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