I must put my opinion onto this topic. I would definately recommend sampling vinyls and e-digging. With sampling vinyl records, you have to be careful of everything in your setup. You gotta have a great turntable, a good needle/cartridge, a usb phono preamp or mixer that you can hook it up to your pc. If you get yourself one of those cheap usb turntables, they have shitty built in preamps , so the sonic quality will be neglected. It's a whole system that must be in place, to get the most out of your vinyl. Also with vinyl you gotta be aware that some records might be in poor quality from over use, and might have the grooves worn out. So it would be the best to get good vinyl records, if your looking for high quality.
With e-digging, nowadays you can get excellent quality files available online that you wouldnt be able to find on vinyl , thanks to the location you live in. Especially with youtube people all around the world are uploaidng there vinyl record collections ,and with 1080p quality you could rip it straight off youtube into a high quality WAV file. Also you can also find alot of FLAC files of specific artist lp's from the vintage era, if you look on the net. I highly recommend you dont sample mp3's since there a pretty low audio quality, especially for music production.