Neal, I'll try to answer the best I can. Dr. huey root stock does well in alkaline soils. Multiflora is recommended east of the rocky mountains and northern zones. I've also have turned to Paul Zimmerman for advice as this has always worked well here. Even in Kentucky he would recommend when planting to make sure to bury the grafted part of the rose. I also plant on an 50 degree angle. If your rose is naturally vigorous it will put down its own roots and they will grow big and strong.
Used to grow about 400 roses way back. When I finally decided no chemicals (they were being banned in countries every where) so why was I still using them. Well I got to dig up a lot of roses. Dr. huey roots were horrible here. Multiflora was better but the hands down winners were the own root roses. They had the biggest deepest roots of the bunch. Stressing here that this in my experience only.
Now varieties, I'm having fantastic results with Kordes roses. Not all Kordes roses are no spray roses. I check with Newflora as each rose has disease and powdery mildew ratings and I plant only those with three or four star ratings. I find these to be very vigorous healthy roses. So many hybridizers working now to produce heathy vigorous roses the future is looking good for me.
I'm sorry to yack so much when you only asked about multiflora root stock. Yes, it should do best for you. Thou I vote for trying 1 own root Kordes from Chamblee's and see what it does for you. All of my plants from Palatine have gone own root anyway and are big gorgeous rose bushes. Good Luck! Pat
