Hard to compare the two since the Imagine line from Grand Design is a lower tier RV and is not in the same class as Lance TTs, the Reflection and Solitude lines would be more comparable. That being said both are good choices, and both will have issues like any new RV. Grand Design and Lance do a decent job of getting issues resolved under warranty from what I have heard and read, we know people who own both, and for the most part they are happy.
I like the floorplans from Grand Design a smidge better, primarily because I prefer bigger RVs for those longer excursions where extra living space is always a good thing. As mentioned above, particularly if this is your first RV, buying slighty used will save you the depreciation, along with the frustration of dealing with warranty issues since most of them occur during the first year of ownership. Happy RV hunting, here's hoping you enjoy the RVing lifestyle as much as we do.
