Frankly, I haven't figured out if the wick length makes any difference. I've got both kinds. Some of the short wick versions work fine, and others don't. Likewise, some of the long wick versions work well and others don't.
I think the quality control on these is horrible, and that's where the variations come from. If I could find some that worked well consistently, I wouldn't care how long or how short the wicks were. Tipping the short wick ones is no problem for me.