Which Ups is better (Emerson Liebert ITON 1000VA/Powercom BNT 1000VA)

I need to know which UPS is better for PC in reliability / performance

1. Emerson Liebert ITON 1000VA

2. Powercom Black Knight BNT 1000AP

All are requested to share your knowledge / experiences with these models.

Regards

Saad Saleem

Karachi