Aluminum vs Fiberglass Siding?

We are not using siding as the primary factor in our buying decision, but it is important to us. This will be my 7th RV, I've had 2 with aluminum siding. That experience, and a week of researching this subject in relationship to new RV's tells me the only advantages to aluminum siding is that its lighter now, and in most cases cheaper than fiberglass. The downsides are the pain it is to clean and detail it, and the higher expense to repair it. That, I was "finally" able to confirm by a RV dealer's paint & body shop manager, who writes their estimates. Also, a couple people told me mfg's don't stock the color selections per model as long as they used to. One of these people said he had to order some aluminum siding while on the road last year and the freight was more than the siding. Since were going to be on the road for a year or more, I think we are going with fiberglass siding, that any good paint and body shop can repair, anywhere, even Mexico and Canada.
Thank you all for your input!!!