Since DH is a Radisson employee, we have stayed at both. The Parkway is a beautiful resort. but we found the shuttle service a bit inconvient and it would cost us about $20.00 in cab fare to return each evening.
On the other hand, RLB is very nice hotel, not as fancy as the Parkway, but if you miss the shuttle it's a 2 minute, $5.00 ride to Downtown Disney. I don't remember using the shuttle from there at all last year. Since we spend so little time in our room, we look for the convience. After spending the last 12 years on property, it takes some getting use to staying off-site, but with his employee discount we can manage to stay an extra 3 days. Well worth it IMHO. Hope this helps. I don't think you'll be dissaponted in either choice.