Well 1440p 144hz would be the best all-rounder for the moment.
1070 is ok for 1440p 144hz. Not the best but ok.
If you take such monitor with GSync, GSync will help under fluctuating or lower FPS too.
If the game does not give you enough FPS you can still set the game settings lower or run the game with 1080p 144hz.
27" 1440p 144hz monitor with GSync is quite expensive tho'.
If budget is your issue and you can only to pick between 1440p 60Hz or 1080p 144Hz, You need to make decision depending on the games you play most.
For mostly RPGs, 1440p 60Hz.
For fast paced games e.g. shooting, racing, etc., 1080p 144hz.