Crack/u vs CL Mocks – Which one should I buy if I already have IMS?

I already have the IMS mock series and I'm planning to buy one more. I'm confused between Crack u and CL.

I've heard good things about both, but I'd like to know which one is better in terms of:

• Actual CAT-level difficulty
• Quality of questions
• Quality of analysis and solutions
• Overall value for preparation

For those who've used either (or both), which one would you recommend and why?

Also, do you think it's worth buying both, or is it better to stick to one additional mock series and analyze it thoroughly?