here's a summary from a u.s. site called glockparts dot com:
WHICH NIGHT SIGHT SHOULD I CHOOSE?
WE CARRY SEVERAL TYPES, EACH OF WHICH HAVE THEIR OWN BENEFITS.
TRIJICON, MEPROLIGHT, AMERIGLO, TRUGLO, AND GLOCK.
•THE MOST POPULAR AND WIDELY USED BY LAW ENFORCEMENT ARE THE TRIJICON NIGHT SIGHTS. THEY HAVE A FINER DOT THAN MOST AND A 12 YEAR WARRANTY. THEY NEED THE REAR SIGHT TOOL IN ORDER TO INSTALL THEM.
•THE MEPROLIGHT NIGHT SIGHTS ARE ALSO AN EXCELLENT CHOICE AT A LITTLE MORE COMPETITIVE PRICE POINT. THEY ARE MADE IN ISRAEL AND HAVE A LARGER DOT ON THEM. THE MEPROLIGHT ALSO NEED THE REAR SIGHT TOOL IN ORDER TO INSTALL THEM. THEY COME WITH A 12 YEAR WARRANTY.
•THE AMERIGLO NIGHT SIGHTS ARE AN EXCELLENT VALUE AND THEY COME WITH THE HEX WRENCH NEEDED TO INSTALL THEM. IF YOU DON'T HAVE THE REAR SIGHT TOOL AND DON'T HAVE AN ARMORER AVAILABLE, THE AMERIGLO SIGHTS ARE A GOOD CHOICE. THEY HAVE A 12YR WARRANTY.
•THE TRUGLO NIGHT SIGHTS ARE ANOTHER GOOD VALUE SIGHT THAT YOU CAN INSTALL YOURSELF, WITH ONLY A HEX WRENCH. THEY ARE CURRENTLY AVAILABLE IN TRITIUM FOR TOTALLY DARK USE, THE FIBER OPTIC VERSION THAT USES AMBIENT LIGHT TO ILLUMINATE THE DOTS, OR THE COMBINATION TRITIUM/FIBER OPTIC COMBINATION (TFO). THE TFO IS MY PERSONAL FAVORITE BECAUSE THEY WORK GREAT IN DAYLIGHT, DUSK, AND DARK. THE BRIGHTEST NIGHT SIGHT I HAVE EVER SEEN! THEY COME WITH A 90 DAY WARRANTY.
•THE GLOCK NIGHT SIGHTS ARE ACTUALLY MANUFACTURED BY MEPROLIGHT AND THE TRITIUM DOTS ARE SIMILAR TO THE MEPROLIGHT, BUT THE HOUSING IS A LITTLE DIFFERENT. THE DOWNSIDE TO THE GLOCK NIGHT SIGHTS IS THE FRONT SIGHT. IT MUST BE CRIMPED ON. THIS MEANS THAT YOU WILL NEED THE FRONT CRIMP ON TOOL OR AN ARMORER TO INSTALL THEM. (WE CAN INSTALL THESE ALSO) IT NEEDS THE REAR SIGHT TOOL TO INSTALL THE REAR SIGHT. THEY COME WITH A 10 YR. WARRANTY.
•The XS SIGHT SYSTEM NIGHT SIGHTS ARE A GOOD CHOICE FOR THOSE SHOOTERS WHO WANT A QUICK FRONT SIGHT ACQUISITION. IT IS BASICALLY DOT THE 'I' SIGHT PICTURE. THEY ARE MANUFACTURED BY TRIJICON AND HAVE A 12 YEAR WARRANTY. THEY COME WITH EVERYTING YOU NEED TO INSTALL THEM ON YOUR GLOCK PISTOL. DOES NOT NEED A PUSH TOOL FOR THE REAR SIGHT