So many intakes not enough $$$

Engine combo has a lot to do with it.
Also, what the car is intended for.

An example (in extremes) of such can be;

408 cubes coupled with;
Small, cam, headers, low stall converter, 3.55’s and numerically smaller gears, intended for Hwy driving and some strip, = dual plane.

Big, cam (like a 250@050 & greater) higher numeric gear ratio (4.10’s and up) more so intended for a blvd. bruiser or more track, a single (small) plane is best.

A big single plane like a super Victor or an Indy are really racing intakes and everything else to back it up.

What is your goal?