If you end up getting a tenor ukulele and stringing it DGBE, playing that ukulele will help you to learn the different names for chord shapes in DGBE tuning (a C chord ahape in GCEA tuning is a G chord shape in DGBE tuning, for example), but it may not be a good audition for whether you would like a baritone. By virtue of its longer scale and larger body, a baritone in DGBE tuning is likely to sound more resonant and have more sustain than a tenor in the same DGBE tuning. To get the full "baritone experience," you really ought to get a baritone ukulele, even if you just buy an inexpensive one to see if you like it.