AK47frizzle

You want the higher ones. Low profile ones might not let you mount the scope.

Once you have a working set of higher ones you can start to mess about finding lower ones having measured the gap. Taking the guess work out of it. Nothing worse than going too low.

Higher ones will also help with that dyei4 mask in your profile! Again going to low will mean you have to bring the rifle up higher to the eye. It's generally easier to have the scope higher and the adjustable butt plate extended down to make  your sighting position as natural and comfortable as possible. It'll improve your aim because everything will be working with your body shape rather than you having to contort to the gun.

In woodland I’d definitely suggest a 40 objective over a 32.

The Front element size means nothing. You have to look at the FOV values.

The Curve of the front element will give you more field of view not the size of the glass. A larger element may give better light transfer but only on a decent scope.

Looking at a static point 100M away the area you will see through each scope.

The 2-7x32 has 15.5M at 2x and 4.7M at 7x.
The 3x9x40 has 13M at 3x and 4.2M at 9x.

A different brand vortex also do a 3x9x40.
It only has 10.4M at 3x and 3.8M at 9x. Flatter front element.

Vortex also do a 3-9x50. Larger front element
It has even less FOV. 9.8M at 3x and 3.9M at 9x.

It's not a clear cut solution to just think more glass is better. Never has been. The disadvantage of a more curved front element is distortion at the field edges. However that only has a major effect if you need to use the full scope for a holdover. We don't have the range in airsoft to care about this.

Light transmission is a factor, but technology has pushed glass manufacture to a point where even cheap lenses can have clear glass with good light transmission. Long gone are the days of dark scopes because you couldn't afford premium glass.

Flatter elements are better for parallax adjustment for range finding. They give better target separation so you can use the scope as a more effective range finder provided you know the size of the object you are shooting at. Again very useful for target shooters and snipers since they operate against targets of know size. And can use a conversion table of size, zoom and parallax to work out holdovers for a killing shot.