We picked the 2720 because it was the biggest that fit in the garage and it also sleeps the most.
When we bought it, our son (now 26) was in college and raced mountain bikes. So we used it as a base at mountain bike races. At 6 foot 4 he slept in the front bunk and petite daughter, though she could have slept on the dinette, slept in her backpacking tent. Allegedly I snore.
Our son now sleeps in his own tent.
Sometimes w take my wife's blind bother. He sleeps in the font bunk. When goes with us, one of his two son's (26) usually goes along. He sometimes sleeps in he dinette and sometimes sleeps in a tent, depending on how his dad is feeling. If it looks like his dad needs additional help, due to other medical issues, then he sleeps in the trailer.
When it is just the two of us we sometimes wonder if we should have gotten the SL or SD instead. For just two people, the front bunk becomes an awkward to use storage area, at least for us.
But, just about that time we realize that with our son getting married in July, in a few years we may have grand children, in which case the front bunk will be handy again.
My wife's parents, when they were still alive, had two different motor homes. the fist was a 28 foot Southwind. The second was a 32 or 34 foot Bounder. We borrowed both. Neither had slides.
When camping, you lose about 6 feet off the front, though you can pile stuff on the dash and seats. So 28 becomes 22 and 34 becomes 28 feet. The same size as our TM.
In either MH, it was difficult to have people inside while preparing meals. The kitchen was very small in both motor homes. In our TM, one person can work on he counter behind the stove, one at the sink and another at the table. a little tight but doable. Since it never rains in California
we rarely need to do this as we frequently cook outside. However, if you don't live in California, hen you may encounter more rain than we do. Therefore, you will be indoors more often than we are. So consider how many people will be inside and where, especially during meal prep time.
When we retire we will likely buy something bigger, but still keep the TM. By then it will be 16 years old. Not enough residual value to put much of a dent in the new trailer. By keeping it we can still use it to go where the new trailer can not go, or let the kids use it.