Ernesto-
Welcome to the forums, and prepare for either few responses or too many... Your question hints at possibility it is early in the search process, and there are so many choices folks may not know how to respond yet... Now that you're a member, you can "search" using link in blue bar above, and search for Bambi or 23 and see what you can read about. There are also echains of messages (threads) on new v. used v. Vintage, etc etc...
With all these disclaimers, here are some thoughts...
1. What interior style is important? Safari offers vinly or bare metal interiors, Bambi's offer Safari or CCD versions which are more striking and modern.
2. Bath requirements? The 23 offers "Dry Bath" which separates shower from toilet, as does 19' Bambi, while 22' and smaller Bambi offer wet bath, taking less space...
3. Sleeping arrangements? Is a bed enough, or might a second bed someday be required? If so, then larger is better..
4. Tow Vehicle? You indicate you're getting a bigger one, and larger diesel SUV will make decision unimportant, but good advice seems to be to limit GVWR of trailer to 80% of towing capacity of tow vehicle.
5. How long will you be using it? Larger trailers offer more propane, more fresh water, larger holding tanks and more storage. If it is used for weekend trips, it may not matter, but for longer trips the extra tank space and storage might...
6. Finally, two axles offer more tires to maintain, brakes to keep repaired, bearings to maintain, etc, but less excitement in the event of a tire failure. Many many members here happily traveling all over the world with single axles, but it may be consideration to you...
If you haven't talked to owners and spent time in the different models, I'd recommend attending a get-together and visiting a larger dealer and just sitting in and imagining how you'd use each model. Happily, each member here and many in WBCCI are certified "Opinion Holders" and many are willing to share.
You just need to do some filtering and evaluating after the sharing...
Good Luck!
John McG