Do what I did last year and build a pc. You don't pay to play online, can choose the hardware/game settings YOU want, access to steam which means huge savings on games, mods/user generated content, AND you get a very nice desktop.
PC + Wii U = I never need to buy a PS4 or Xbox One.
For splatzones go for a weapon that can cover a wide area very quickly like the aerospray. If you see you're outnumbered try to hide and wait for help and then spring on your enemies. Also when the round first starts it's not a bad idea to create an alternative route with ink in case you get sent back to base.
I'd also say playing for kills is a good deal more important than in nonranked.