Both are CAE facilities. The difference in "quality" should be negligible. However, Canada / Montreal is in lockdown. And it's very difficult to get all the necessary permits to travel to YUL. CAE does help but efforts are hampered by local authorities. Prepare to be in quarantine for 1 week before you can start the course (2 negative PCR tests required before you are allowed out of the hotel to CAE facilities). QoL is better in Dubai as long as COVID remains the dominant factor. 5500 course is "initial" 5000 with difference course due to slightly different characteristics (wing) and performance (engine).