From personal experience, it takes more time to collect all the items needed to make a weapon with Break Damage Limit, Triple Overdrive etc... than it does to get most of the celestial weapons (with the exception of wakka's probably).

many of the tasks required to gain the sigils can be quite tedious (chocobo racing and lightning dogding), but so can collecting 60 dark matter from creatures in the monster arena to customize Break Damage Limit onto a weapon...