My Pro CDP (1998 vintage) has been carried since purchase, and it's frame has had no issues. I think the aluminum may show wear/dings a bit easier. but the trade-off is less weight to carry. I have several 1911's in my carry rotation, and some are steel and others aluminum. I've carried a 1911 so long that frame composition really makes no difference to me any more. If there were a vast difference in durability, the aluminum frames would likely cease to exist. If memory serves, S&W doesn't even offer a steel framed 1911 any more...

Nice to have a choice, at any rate.......
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Freedom has a flavor the protected can never taste...
USMC 8652, 2531, RVN Jun '67, - May 69
Some of my toys