The following tests were done at the same locations with 2 different modules inside the Mudi, EC25-E and EP06-E. For all tests the Mudi was in my jacket pocket at around hip height. No metal was near the Mudi to affect reception. The Mudi was also using the default settings. I only set the password on initial install, nothing more. My Huawei Mate 20 Pro was connected to the 5ghz wifi of the Mudi for the tests.
EDIT: Added GLOBAL module to the tests bellow (Quectel EG25-G)
Operator: Tele2 / Comviq
Suburbs
EG25-G
EP06-E
Peak
EG25-G
EP06-E
Park
EG25-G
EP06-E
City
EG25-G
EP06-E
Operator: Telia
Suburbs
EC25-E
EG25-G
EP06-E
Peak
EC25-E
EG25-G
EP06-E
Park
EC25-E
EG25-G
EP06-E
City
EC25-E
EG25-G
EP06-E
Results
The EP06 CAT6 module is more stable overall with less dropped packets and was consistently faster than the CAT4 modules. For Telia it was rated limited to 50mbit for some reason, but that is just my subscription i guess. My recommendation is you get the CAT6 modules and swap them if you need to go from one region to the next.
The EG25-G global module is more convenient, but you loose the stability. It might just require a firmware update, but at this moment the CAT6 modules are still faster and more stable.