Personal experience on both products:
I won't be repurchasing the Maybelline liner. I will, however,
continue to use the MAC fluidline as it's the best I've used so far but I'll
still be on the lookout for the ultimate liner. I think a waterproof liner is
essential in any make-up artist's kit.
The next gel liner I'd like to try is the Make Up Forever
Waterproof Aqua Cream liner.