11.2 HF1 or 11.1 HF5 ?

if i were you, i would use 11.2.1.

Minor release numbers are used as follows;

 

 

Minor (point release) version numbers (x.2) are numbered as follows;

 

•Even numbered – feature releases; you would generally only use this if it included a feature that you required.

 

•Odd number – maintenance release; likely more stable than a feature release and will include bug fixes and security enhancements.

 

 

But of course, it's never that clear cut and I'd advice you to follow nitass's advice.

Backing Nitas for using 11.2.1