Keno -Wheel 2x 7/4 or 1x 8/4 ?

Need a math guy here. Not a "system," but i'd like to know whats better(no lectures or rants about gambling pls)

Ontario keno 1-70, 20 numbers drawn but if you want to use US keno 1-80 please feel free, im sure it works out the same in figuring out which to use, i hope..

So Question????

I have $70 want to wheel/box the 4(four) spot

2 options which is mathamatically superior? Or are they the same???

7 numbers boxed into 4 combos is 35, so i can do 2 of these wheels for $70. 1 in 20 of hitting except the 2x part?

Would it become 2 in 20? So 1 in 10??

8 numbers boxed into 4 number combos is 70, so i can do one of these. 1in 12 of hitting supposedly

What would be better mathamatically? Picking 8/80numbers getting 70 lines or
35 lines, 7/ 80 and another 35 lines 7/80

And the goal is to hit all four in one wheel, so i see that picking 8 is better vs 7 but i can cover 14 numbers

Thanks

Keno? What's Keno precious?