We graduated from a Starcraft to a TM this year. We had the popup for 5 years and enjoyed using it, but found a number of particular things that encouraged us towards the TM.
Someone mentioned the
gray water tank. Our Starcraft had a drain, but we had to connect a 15 gal low profile "blue tank" to catch gray water, and then empty it at the end of a weekend. And we typically filled it up. 15 gals of water is no mean feat to lift into the back of a truck or SUV to take to the dump. I actually messed up my back last fall trying to get ours out of the SUV at the dump.
Not fond memories.
Second is
bears.
We camp a lot in the Colorado mountains, and every state park and most if not all Forest Service parks require you to store food in a hardsided vehicle at night and during the day if you are gone from your site. Got really tired of that with the Starcraft.
Third is
storage.
The Starcraft had storage under the seats, and a small cabinet - but those were easily filled with cooking gear and a few other camping items. No room to store food or clothes when traveling. The TM has the ability for us to load up the trailer and carry almost nothing in the TV. When DW transferred all our gear from the Starcraft to the TM, she was amazed at how much space we still had left to use.
Negative? The 5 yr old Starcraft cost us $4400. Our 5 year old TM was $17000. But well worth the difference.
Hope that helps.
Alan