Two totally different resorts both have their charms. You will not feel as though you are doing a repeat by any means.
My take:
The Poly is more immersive and lively. I get more of a Hawaii type kitschy vibe there. Trader Sams is a draw unto itself, along with Ohana. Their luau is top notch. All this draws non-resort guests, there will be many mulling about. The volcano pool is small, very popular with especially with the kiddos. The other pool is very quiet and relaxing. However, there is something very special bout being in the volcano pool and watching the MK FW! PS Tokelau is a great choice for DVC as to being close to everything. We had a standard studio and had bit of lagoon view. Loved the two bathrooms too. Will be there next month, booked a resort room at a great rate - WOOT!
RPH tends to be our home base when @ Universal as it’s generally the least expensive offering with Fotl perk. Before the series of room rennovations, it had lovely carved Balinese invoking woodwork in the rooms. That is the vibe I get in the hotel. There often are large conventions there you may need to work around as to dining at the resort, especially since the one restaurant is still closed but citiwalk has many close, fun alternatives. Far easier that trekking to DTD area. There is an interesting backstory of Jake, a traveler in the 40’s that is reflected throughout the resort’s design & theming. The reflecting pool is lovely at night, well, when the smokers aren’t there. The orchid lounge is nice, great sushi. Pool is larger but also gets crowded and noisy.
You will find yourself when at WDW after U, missing the FOTL perk, which makes for an entirely different approach to the parks. It surely gives you much more time to enjoy the resort. I tend to advise people to do WDW first, then U to avoid an unfavorable comparison lol. You also are permitted to poolhop to the other resorts for a change of pace.
Enjoy!