The Broadmobi devices all support more bands and will thus work in more places.
Both are largely identical, depending on the used band. Maximum transmission power depends on the band you’re using at the time, but they are in the same ballpark for all devices.
The characteristic is more dependent on the antenna location an design and this will necessarily be identical for both variants.
The Broadmobi devices are Cat4 devices and thus generally faster than the Cat3 Gemalto.
Freeing either of those devices is highly unlikely and there will be no blobs (which by definition are binary components loaded by the host system).