1 - Creator X - Lots of Media options, Dual Struding works extremely well, Great support from company
2 - Rostock - Greater Build Area, Faster printing, Cool-Factor
3 - Replicator 2 - Ease of Use
If you don't mind the "20+ hour Assemble and Tweak" process and you need the largest build area, the Rostock Max is the best option of the three because it has a larger build area and can print a little bit faster than the other printers. (though my dialed-in Creator X can print hella fast) And, like the Creator X, it can handle ABS/PLA/PET/Bridge Media. I'm currently designing a M-ITX computer case while I tweak mine. NO DUAL STRUDING unless you replace the print head with a dual extruder and re-calibrate everything
If you don't want to take the 20+ people-hrs building one, the Creator X is the best choice. I had issues with mine because it arrived damaged and it took a while to get fixed and dialed in. The support from Flash Forge was fantastic. They stood behind their product and I can't say enough good things about them. This is the one I use most now. Mainly because I am doing a lot of Dual-Struding. (Using both print heads on the same print) It's dimensionally-accurate (to sub 1mm) and I use it mainly to print Legos, motorcycle parts (Clutch/Brake Levers) and multi-color Common Access Card (CAC Card) holders which hold 2,3, or even 4 CAC Cards (NFL Team Colors, Blue & Gold for Navy, Red & Gold for Marines, Pink & Pink for Air Force pussies.)
I bought the Replicator 2 because it was my initial foray into 3D printing and I wanted an easy to use printer. It is "set it and forget it" easy to use. So much so that you should probably expect a call from Ron Popeil when you click "Print". Within 2 days of unboxing it, I started a 29 hour print project and never worried that it would mess up partially through the process.(which can sometimes happen with ABS due to temperature differentials in the piece being printed if it's relatively tall) I don't recommend it though due to the high investment and the mfgr's policies regarding support.