I will be buried with my glitter liners, I love them so much! Personally my favorite is Spandex, the black-ish one with blue in it. I really like that you can layer the glitter liners really easily depending on how much glitter you want. One layer is a very subtle glimmer where as three is full on sparkle.
I really was not a big fan of liquid liners until UD came out with theirs I had the hardest time getting a thin neat line but the brush on the UD ones helps with that. The brush is shorter than the MAC Liquidlast liners and I find it much easier to control. If your fond of bright colors my favorites are Radium (royal blue) and Acid Rain (lime green).
Hope this helps. Have fun with whatever you decide on!