Comparison of MK AGM batteries & Absolyte IIP AGM

Dear Experts

We are planning to use Batteries for our system
We have two choices. One is MK AGM batteries & other is Absolyte IIP AGM batteries. We have very tight budget so we wish to use MK but our client is asking for Absolyte IIP. Can any one inform me about followings?
• Comparison of Both batteries in form of advantages & disadvantages
• Normal operating life of both batteries
• Any plus points of MK over Absolyte IIP