titan x 3 way sli

I have asus x99 motherborad, CPU is 5930k ,32g ddr2400 ram, titanx x sli, however, I brought lg 34gl750b 34inch utral wide monitor (2560 x1080) 144hrz at this week, I play witcher 3 just have appr.70~100fps, BF V have around, 90~110fps, The question is should I buy 2080super or 2080 ti to...