ABS is 'difficult' for most printers due to warping and climate control requirements.

PLA is great at printing but brittle.

PETG is good rounder of both PLA and ABS, and most find it easier to print with than PLA and give nicer results.

Nylon is good, but difficult to store, as absorbs moisture quickly, so use it but make sure its nice and airtight with dessicant. Good against attack from battles

PC needs all metal hotend but is great for battle ants.

The ultimaker should handle PETG fine.

I print my ants and have had printers since 2007, so i have a bit of background knowledge id like to think