A beaver tail on a Sig isn't really needed. More of a looks thing imo. I don't think you would be able to get higher up on it.
Also buy the Sig online with a good sale. The msrp is not even close to what you can get them for. My fde P227 was $699. Msrp is like $1015. I've seen the basic p226 for around the same price quite recently. Example of a out if stock deal from a week ago
https://www.slickguns.com/product/sig-sauer-p226-extreme-elite-9mm-44-151-erg-919
Try the M&P pro series, it's much better. There is also the M&P pro series C.O.R.E set up for a delta point/fast fire/rmr.
If I was looking at striker my choice would be between the P320, VP9 or M&P pro series C.O.R.E.
I'm not a fan of the XD looks(nerf gun "grip zone") or back strap.
Another thing to remember about the Sig price even at the $8-900. Fantastic grips, good 3 dot night sights, good trigger(SRT) and nice features.
Those Legion pistols are expensive though. Don't expect to find one cheap.