Risk/Reward-Debitspread Option Scanner?

I have scanner for that in python and it calculate it by fetching data from TD Ameritrade api

 

Ok,here is the thing..How do you know,without backtestng,if buying verticals with low 30 day IV is the way to go?? Does it definetly outperform high 30 day IV??

Is the purchase of verticals a better play than buying the common??

And why "10 points wide"?

Which strikes 10 point wide??

ATM,ITM,OTM???

if you dont backtest,its kind of a punt...