What kit are you building? Some of their kits are made from ABS (and some parts in others).

Myself, on plastic I use CA gel (with accelerator...because I'm impatient). That works fine for all of Tamiya's kits (based on my personal experience and I've built them all). On ABS, CA discolors the ABS around the glue (makes it white). Never been a problem though, as it gets covered in the paint booth...

Rubber cement (I use Elmers) is nice for holding parts on that you'll likely need to remove...such as a muzzle brake, or the drive sprocket hub covers. I recently have switched over to Liquid Electrical Tape (from Home Depot). I like it better, as it holds a bit more aggressively, and is easier to peel off if I need to remove the part.

Just remember, glues are like baseball bats...everyone's got their own favorite one (not just one for the whole team). Enjoy the build.