As said here the 13174 is an imported version of the 45090. I will offer my take on this topic based on my personal opinion and experience:
1. I do not feel that the 13174 is firmer then the 45090s - they are about the same in terms of softness. Comparing to other imported groups the 13174 and 12003 would be the softest ones.
2. It seats about 1/5" lower because of the different reclining mechanism that Berkline used on the imported groups. They used proprietor reclining mech. on their domestic groups (including the 45090), and it had higher seating.
3. I also do not feel that the 45090s are of any better quality then the 13174s. I actually had more problems with the domestic groups comparing to the imported ones. I would only have gone with the domestic group if I needed some customization in terms of configuration, cover, options, and that would have come with the higher price tag. I strongly believe that the 13174 was/is a better value.
Regarding the height - if you are 5'7" I would recommend checking out the 12006 instead. This chair will provide a nice head support without blocking your surround sound. The 13174s may work as well, though.
Fusion Collection Seating
Ultimate Home Entertainment