Generally, most Final Fantasy protagonists created after FF6 eventually make me want to murder them horribly. Maybe it's the compulsory emo/wackiness crap, maybe it's the shoddy writing, their unbelievable ability to act completely retarded, or all of those put together. But I personally evaluate this kind of vs. situation like this - whoever makes want to kill them first loses.
Tidus was actually somewhat tolerable up until the ungodly horrible laugh scene, so he lasted at least several hours.
I wanted to strangle Zidane within the first fifteen minutes. So Tidus takes this one IMO.
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