TM3 VS Arrow Trader?
 

Which one is better?

I'm mainly concerned with speed, anti-cheat features and customizability.

TM3 hasn't been updated in a while but has some nice features

ATX I like more and version 2.0 should be out in a few months hopefully

I guess ATX ROCKS!

If you can actually get a hold of the TM3 guys and you know how to spot cheaters without needing the script to do that for you, it runs circles around ATX in terms of trading algo.

ATX on the other hand does a decent job at running a site and has quite a few bells and whistles, plus support is top notch.

i just spoke to TM3 guys today :)