Welcome Tony,
Im new here myself. They seem to be a helpful bunch.
This link may help you to understand your audiogram:
In particular, the levels of hearing loss are classified on this chart:
This suggests that your left ear suffers from a loss that is well into the profound level, with your right ear not far behind.
As to the Unitron vs Advance question, bear in mind that Specsavers Advance comes in 6 different levels of tech with consequent different pricing levels. The Advance Elite seems to be their highest level of tech, and is likely to be a re-brand of either a Phonak Paradise P9 or a Unitron Moxi Blu 9. Its likely therefore that the Advance Elite is a better value than the Moxi Blu 5 if its coming to you at a lower cost.
Dont be afraid to take out a trial of both to see how well they work for you. Also, ask about whether its a receiver in canal style or complete in canal that is being proposed. With your loss being so severe, you may benefit from behind the ear/ultra power aids rather than the receiver in canal type.
Note: I am NOT an audiologist- I’ve just been dealing with my own hearing loss issues for 25 years.