After checking the math in certain scenarios, here's some extra info:
Water: Crossenders.
Crossenders is on par or better in all aspects compared to the holy knight sabers, besides the one slot. There is still a damage difference of 18 true raw after taking affinity into account. Definately agreeing with this.
Ice: Appallagombs
Appallagombs vs Gelid Soul is dependant on how you use your weapons. Appallagombs are better if you use a lot of high raw attacks (like demon dance or the regular draw attack) against weak spots.1
However, if you use lots of small quick attacks (archdemon draw attack, regular X attacks, etc) then the small difference in elemental damage quickly adds up and Gelid Soul will win in the long run, even with lower sharpness.
Thunder: Suzuka Otakemaru
I'd argue on this point. After taking affinity into account both Suzuka and Neo have similar raw (Suzuka gets 298, Neo gets 294). The problem with these is more in the sharpness.
Suzuka has a decent sliver of purple sharpness, but not that much white, so you'll have to retreat to sharpen up quite often.
Neo has even less purple sharpness, but a huge chunk of white, so you can keep fighting for a long while. (Neo's white ends around the same time Suzuka's blue would end)
That means Neo would be a better choice for longer fights (bolded for skimmers)
With that said, the big difference in raw leaves the Wunderkirins lacking in damage even against spots with high cut and low elemental resists.
Dragon: Le Shangri-La
Shangri-La is the best in raw damage due to the sharpness (affinity bumps true raw up to 275), although "angst" is a very close contender to monsters that are weak to Dragon, if you can keep the sharpness up.
1 In this case, "weak spots" means any spot that takes 40% or more cutting damage. Damage values used were Diablos head/tail, where head takes 24% cut and 20% ice damage, and tail takes 50% cut and 10% ice damage.