MBG have bright pins...I am the same as you except my 50 yard pin is Red...
Due to human eyes...with all pins Red will be the first to fade in low light..second will be the yellow...and when you cant see the others Green will still be shinning...natural light
The Red 50 pin gives me an instant yardage when looking at multiple pins...
I presently am shooting the .19 ...I like the .19 because in low light it is brighter than .10 ...But smaller than the .29 for more precise spot shooting [aimsmall hit small]
Pending on age us older shooters may have issues seeing the .10 ...some even with the .19 so .29 is their choice
Neil