Personally, I like the stamped ones.
Lighter, waaaay cheaper. I've shot some very accurate milled receiver guns. Like 1.5" off the bench at 100 yds with very average ammo. But my 5.45 stamped AKS-74 will do about 2" at the same distance, off the same bench, with mil surplus ammo, so I haven't noticed any practical benefit from the added weight and cost.
Carrying one and using one in dynamic situations make the lighter weight a plus.
Practical service life is far greater with both guns than almost any shooter -- even in wartime -- would ever exceed, so no measurable difference there.