I've built two .308 Match Garands, and have a Springfield M1Aicon heavybarrel and a Chinese M14S with match mods.

Both of the .308 Match Garands I have shoot really well and are easy on brass. The reason I got interested in .308 Garands is because old shooters told me that the M1 was more accurate than the M14, and the .308 was more accurate than the .30-'06. Just my experience, but i think the bedding on Garands lasts longer before needing a re-do. Garand parts are a good bit cheaper and easier to find. Some jurisdictions won't let you have a flash suppressor or detachable magazine on the M1A.

The M1A I have shot quite well until the barrel became quite worn, and still shoots decently. The M14S I have not shot that much. Both beat up brass pretty quick.

Kreiger had a special on .308 Garand barrels on their website recently, and I bought one. The other two .308 Garand barrels I have used are Douglas barrels from the Douglas website.