Dolphin is also location location location, while I like POR and have stayed there twice. The Dolphin is hands down the better option. I am sure others will share on transportation. I know going bac to airport there are always an abundance of town cars waiting outside to take you where you need to go. You could also book a town car service ahead of time which will take you and pick you up. Since it's been so long since we have done this. i will let others chime in and give you a name of a company.
I agree that the Dolphin is a MUCH better location and is the nicer hotel overall, but my main concern is transportation to/from the airport. My two kids are 3 and 1 and we won't be bringing car seats most likely so we can't really do a town car so it would have to be a shuttle of some sort where seat belts aren't required and we can hold our kids.
With my wife being a teacher, we get the discounted rates at the Dolphin/Swan and with that discounted rate the Dolphin would cost about $300 extra for the week after taxes and fees but that does not include the transportation to and from the hotel which could end up being a couple hundred. We might also decide to rent one small car in case we want to run out and get some snacks or whatnot at a grocery store, so that is another $15 per day (although I am not sure if the other resorts charge for parking too so this one may be a wash).
If there was complimentary shuttles to/from the airport, this would be a no brainer.