I started using BHPL after I started getting them dropped from nemesis. Before then, I didn't care to spend the time customizing them nor did I care. (I did use auron's that Omega Weapon dropped a few times though)

Clearly the best weapons are the celestials, but I haven't ever gotten caladbolg, so I just make tidus an Excalibur with some dark matter. I think I put something else on there, but I can't think what xD

I have several sets of armor depending on what is being fought.

For in general fighting, these are awesome
Auto Haste
Auto Protect

and whatever else you feel like putting on. I'm almost POSITIVE defense+ doesn't help any more if you have your stats max'd, but I could be wrong:]