If I buy only one tool between a tile cutter and a wet saw, which one should I buy?
I do not think I would do another tiling project in the near future. 


It may be best to rent or borrow a wet saw; Buy one on eBay; or sell your new one on eBay afterwards as a used item.

(community wiki because an unanswered question with answers in  the comments is like a faraway tap dripping in the night.)