Markins Q3T vs. Q3
I recently purchased a used Markins Q3T for my Gitzo GT1541T Tripod. Originally I had the Q3 but after researching I saw that the Q3T has a smaller base meant to accommodate the base on the Gitzo 1 Series Traveler Tripod (1541, 1542, 1544...) and allowing the tripod legs to fold up and fit "flush" against the head. My Q3T also has the quick release plate. I previously used a PhotoClam 33 Ballhead (cheaper than Markins and also Korean) and have had nothing but great experiences with it. Though, the knobs are slightly more accurate on the Markins heads. As far as the Quick Release vs Knob, it comes down to preference as both securely hold the camera.
Markins Q3T vs. Q3
I recently purchased a used Markins Q3T for my Gitzo GT1541T Tripod. Originally I had the Q3 but after researching I saw that the Q3T has a smaller base meant to accommodate the base on the Gitzo 1 Series Traveler Tripod (1541, 1542, 1544...) and allowing the tripod legs to fold up and fit "flush" against the head. My Q3T also has the quick release plate. I previously used a PhotoClam 33 Ballhead (cheaper than Markins and also Korean) and have had nothing but great experiences with it. Though, the knobs are slightly more accurate on the Markins heads. As far as the Quick Release vs Knob, it comes down to preference as both securely hold the camera.