Motor homes, no matter class will require you to tow something to get around. Many Sprinter sizes will not have enough capacity to tow anything. For a given size of living space buying a motor home will require more length. Motor homes, if your towing a vehicle means two drive trains to maintain. Cost per foot of living space is higher.
If you can live with that, then go for it.
Towables are generally less expensive to buy, own, and maintain. Towables will have more living space per foot of actual total length. Towables dont have a second drive train to maintain.
Lots of reasons for both, but dont let the glitter get in your eyes. Pay attention to everything and go foreword.