This is like a which GPS thread, or a what bike thread, by which I mean ask 10 folk the same question and get 10 different answers.
So FWIW the RAC have left me stranded for hours on multiple occasions with work vehicles, on the warmest day of the year last year in Blackpool, on the M57 a couple of months ago, in Liverpool another time, and it's never improved as other lads at work have suffered the same indifference at the hands of the RAC as well, so they will never see a penny of my hard earned, or a penny of any of my relations either, or another penny of my employers when this policy expires.
I have Green Flag, and when Mrs Smoo had to ring them last winter they arrive within 40 mins, where professional and courteous, diagnosed the problem within minutes and resolved it straight away, and their cost of cover was less than the other big boys as well.
You pays your money you takes your chance I reckon.
Queue someone who's had the opposite experience.