I have the MA5B, and I have worked over 200 countries with it on SSB and PSK31. The MA5B will beat any vertical antenna, and it is less nosier. When I compared my MA5B to a G5RV, it was 2 to 4 s-units stronger. Occassionally, the receive signals were the same, but most of the time, the MA5B was louder.
As for the T.G.M. MQ26, the MA5B has a wider bandwidth; however, the T.G.M. gives better gain on 12 and 17 meters. I have used both antennas, I prefer the MA5B.