Stars is great for their micro mtt's, both the 25c and 50c 45 and 90 are great, however it's too bad they don't have both of them in each others fashion (25c are normal, 50c are turbo its too bad each doesn't exist as normal and turbo), for that reason I would suggest the 25c over the 50c to someone looking to grind out those card dead moments as the turbo style can tend to kill you when you go card dead for any amount of time and the steal attempts just faulter.
on the stt sng side of the fence FTP starts at 50c instead of the pstars 1.5 so better micro option there for a grind, granted you have to time it right if you want to put in the multitable volume as the traffic doesn't hit those micros as often as I would like as seems most people in that micro level on a constant basis run the hypers which have a higher varience in general.