New to CG - which program?

Hi everyone. I am a 30 year old man who has been in the gym on more of a “body building” style approach for the last 10 years. I think I’m done with that part of my life but I still want to exercise. My main goals are to become leaner, build/maintain muscle which I have a fair amount off. I’m a little overweight at the moment, could drop a solid 15 pounds.

The main problem is that I have a sciatica issue so my lower back and left leg can be in pain somewhat randomly.

Which program should I do to see results before my wedding in October and beyond (I would eventually like to cycle through the programs)

Thank you!