Is a 34 ACT or 1520 SAT better?

Test Preparation
1

I have a 730 r/w, 790 math (single sitting) sat

And a 36 English, 36 math, 30 reading, 35 science (superscore) on the act
And a 35,36,30,34 single sitting

Which one’s better?

2

The % for each should help you decide; I suspect the ACT is slightly higher.

As the jury is still out regarding how the new SAT and old SAT concord, it might be safer to send the ACT.

Both are fine scores.