Last trip (BARGE and Convention) I stayed in 3 hotels over the 12 days because of comps. The first was Binions, then Venetian, then Silverton. Binions is... well... Binions, but the other two were great. I've always liked Silverton. Rooms are fantastic, $20 trick probably works there, and the casino personnel are fantastic. And where else can you play in the High-Limit slot room for nickel Spin Poker. Venetian, on the other hand, is entirely different. Great as well, on a different scale.
But comps play into your decision. So thumbs up for Paris and Monte Carlo.