while I feel the MaxFlow is a better tank, if you purchase the Shocker 88ci MaxFlow it has the following disadvantages:
* longer tank instead of short and fat like the LT90
* tank and reg are one unit, and reg is for the shocker making it difficult to sell the tank or the marker separately
The length and difficulty re-selling the Shocker and/or the 88ci Shocker Maxflow were the reasons I used a 90ci SS4500 on my Shocker with a verticle MaxFlow. Worked pretty well though wasn't as consistent as I would have liked.
Again, the MaxFlow is the better tank. It would probably be overall lighter since you have one less reg on the marker.