Your own posted video? Are you looking at average or minimums. I always look at minimum fps because that's the more important metric. Only GTA V is an exception(it's probably getting hit by a bottleneck). In Overwatch and Dota 2(both unbiased games), it just outperforms GT 1030 by a huge margin.
ok, talking about the most important minimum metric from video I posted:
1) Overwatch; GT 1030= 40 fps 750ti = 48 fps
2) GTA V; GT 1030 = 32 fps 750ti = 27 fps
3) DOTA 2; GT 1030 = 50 fps 750ti = 48 fps
4) Hitman; GT 1030 = 28 fps (1% low) and 26 fps (0.1% low) 750ti = 25 fps and 22 fps respectively.
5) CSGO; GT 1030 = 100 fps 750ti = 97 fps
I don't think any of the 750ti's performance numbers are 25% above GT 1030. Even worse, the 750ti's minimum are lower than GT 1030's in 4 out of 5 games.
The average of 750ti is marginally better than GT 1030 though, but it doesn't matter because the frames are anyways above 40-50 per second.
It would be a foolish decision to buy a used 750ti over new GT 1030.