I would have considered a trailer but I do antique shows several times a year and need to pull an enclosed trailer. Can't tow a trailer with a trailer.
When we go on trips we take along the motorcycles on a open trailer. When we camp we take the canoe or kayaks and the motorcycles on the open trailer. Motorcycles would be a problem towing a TT. Would have to get a toy hauler and then we would not have as much living space and would have paid just about as much for the toy hauler as we did for out RV. If we bought a standard trailer we'd still have to get a pickup big enough to carry both Harleys and pull the trailer.
I've done both in the past. The plus for a motor home is I think it's easier to drive and park than towing a trailer of the same size. Only negative is not having the tow vehicle to drive around. Ours is 26.5' so it's not very hard to drive or find parking spaces.