The biggest thing to consider IMO is ease of use... Frameless look great, and have some distinct advantages over framed tops, but framed tops have advantages too. Like Rich mentioned, take offs are a big savings when you find them, and honestly, fall/winter is the time to shop for them. Spring they are harder to come by and more expensive due to demand.
Frameless tops are either on or off, or some have the Sunrider feature. If you choose to go topless then you either leave it at home, or try and stuff it in the trunk. Framed tops can be folded out of the way, but are with you as you travel, in case of unexpected weather. They are also a bit easier to manage due to the support from the frame.