G-sync vs high refresh rate

I don't use v-sync and any g-sync, I want a 27-28" ips monitor but its very hard to find a g-sync 27 ips in my budget, I am currently using a 60hz laptop screen and never had a problem,
 
can anyone help, I need to order tomorrow and don't know if to get a 1440p g-sync or 1440p non g-sync 144hz, or get get a 4k 60hz g-sync
 
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