I have been going to Canada for 12 years (and have fished five different lakes) and have used mainly crawlers for our June trips and crawlers and leeches for our late August trip. Minnows are expensive and more work to keep alive than crawlers packed in paper or leeches. If you are going to slip bobber, then a "lively" minnow would be better than a salted I would think (personally, I like a medium leech for slip-bobbering). However, we mainly troll or cast and retrieve and I don't think the walleyes can tell if it is "lively" or not.
It is not uncommon for my buddy and I to go to a drive to lake and have 75-100 fish days. I think location, speed, depth and color make more of a difference than the meat on the end of the line. Fish where the fish are and you will do fine with whatever bait you bring.
Mike Chippewa Falls