The rule I always have been taught is:
The faster on, the faster off.
You cannot compare pastes vs liquids in my book. The paste is always more concentrated and goes on thicker. Thus lasts longer.
Give Zymol a try. It lasts for about 3-4 months, depending on where you are, it goes on real easy, shines up real nice. You'll be done in just a little longer than it takes you to do a really good wash and chamois. Best advantage to it is that it fills scratches so it looks very nice on dark finishes.
Here's a site: http://www.zymol.com
Note that here they're selling their whole kit to Beemer drivers. You can get just the wax for about 12 bux at a good auto parts store. In my area, NAPA carries it.
I did detailing in a previous life, would have sworn by paste waxes, or my personal combination of the canned heavy carnuba and a spreading agent. But they were murder to get on and off and to get to the proper level of shine without an air-powered buffer.
Hope this helps.