You need to get the ujoints with the zerk in the cap, so greasing them is easy.
The best part of the double cardan joint is that it splits the angle among 2 u-joints, so that each u-joint doesnt have as much strain on it as a single joint would. In my Bronco, with all the lift, the shaft operates at a 20 degree angle at the double cardan, so each joint in there is only operating at 10 degrees, which is MUCH more tolerable than a single joint running at 20! And of course the rear joint points almost right at the t-case yoke. Well, 2 degrees down, so that under hard acceleration(when the joints get the most wear) the pinion rises 2 degrees with spring wrap and makes the joint run at zero degrees.
Which is another aspect of the double cardan, in a Bronco like mine, there's 14 inches height difference between the 2 yokes, with only a 40 inch shaft to make up that difference. Since the double cardan shaft requires the single lower joint to be as close to zero degrees as possible, the housing must be shimmed to raise the pinion up, which in turn reduces the height difference in the two yokes.
There are definite benefits to the double cardan, as I learned from studying them before I decided to build my own driveshaft. A single joint shaft in my truck would have a very short life.

 

so if i use the 93 shaft ditch the cardan and since i have no lift i should be good for a couple of days until i get my driveshaft rebuilt? i'm in the process of moving and really need my truck!

 

With a stock truck, the regular single joints will last awhile, but it'll probably have some vibration at highway speeds.