Ramped barrels are considered by "some" as more reliable for feeding, but I'd argue that. I believe a properly set up conventional barrel and a polished feed ramp are just as reliable as using a ramped barrel.
Ramped barrels became the "rage" when people started shooting hotter loads and there was the occassional "blow-out." The ramped barrels, during that same time frame, were offered with chambers that fully supported the cartridge case, so it made sense to switch over and make an improvement to increase safety. Nowadays though, the majority of conventional barrels have fully supporting chambers, so this part of the equation seems a moot point.
It's much less expensive to install and fit a top quality, conventional barrel, so if I was going to send off a late model 1911 because the barrel either was poor or shot out, I'd just spend my extra cash on a good bushing or the installation of some acc-u-rails and stick with the conventional barrel setup. Just my opinion.