Like any cymbal, it's a personal thing. What style of music are you playing? When I test a ride cymbal I play with the tip at the edge of the cymbal, toward the middle and closer toward the bell, as well as on the bell with the tip. I use the shaft of the stick on the bell as well. I like to have ride cymbals that can be crashed so I crash them as well.
I listen to the stick articulation to how tight it is compared to the wash or build up of the cymbal swell as you play. The bell I like to have a clear tone that is mostly separate, but blends well with the wash of the cymbal. As for the crash I like to find one that has a sweet spread that doesn't sound gongy.
I'm not sure if any of that makes sense but if you listen to the areas I suggested you play, just go with a cymbal that qualities that you find pleasing. I actually do the same with crashes. I ride them, play the bell etc.. I love cymbals that are multi purpose.