What do you like the best?

… wish i could help … only ever caught them in crossovers

In my opinion the best you can hope for with any kind of lure for otter is to move them a few feet from where they already are. Some otter urine or poop would be my choice to do that. You can find these materials at otter toilets when you find them. Little scratched up piles of leaves, dirt and grass will have been urinated on and attractive to other otters.

Occasionally otters seem to check out castor but it's pretty hit and miss.

I've been trying to formulate an otter lure that attracts otters consistently for over 20 years, but so far I haven't been able to. I've come up with some that will attract some, but just as many go right on by. The best set I've found that attracts them is making a big gawdy dirt hole right in their toilet. They can't help but investigate it. Other than that, blind sets work great.

Last year I used some of slim pedersens fish eater lure. Like Paul said in a dirthole at their toilet and caught an otter that way. Another thing I noticed as well. I used some of that lure in some dog proofs right along the creek. I noticed more than once where otter got out of the water and investigated a dp lured with that lure. But with all that said the best way to consistently kill otter is with 280s and 330s in blind sets.

PCG Enrager

yes, any and I mean any small creek connecting to bigger water way is a great spot for otter, blind set, they will always check them out,

I believe Lenon's Lure have an Otter lure, Asa said it was designed for coyotes but his father kept catching otters using it if it was near water.

Like Paul said; just the visual of the dirt hole may have made any associated scent moot.

I will say this: A season or two ago I took to stealing fresh otter poops and pouring a little Minnesota Trapline shellfish oil on it. I believe it got an even better response than just the fresh unfamiliar poops themselves, as if... "Dude! Whatcha you been eatin'?!!!"

I've always found otter to be curious creatures. I've caught some in bucket sets, a couple of poplar sticks used to bait beaver, pocket mink and coon sets, and a lot of luck. Never found a scent or bait that worked. It seems they are more attracted to odd things than anything else. If someone said they placed a soup can on shore and caught an otter in a set. I wouldn't be surprised.

Dont rule out a skunky smelling lure......trust me on this.

Or red fox gland lure

mink or weasel glands

Take that money you are going to spend on otter lure and buy another body grip trap

Set that body grip trap in a natural pinch point in the creek, on a channel swing bank, beside a root wad, or in a small creek leading to a bigger creek.

That trap will catch you a lot more otter than that bottle of lure.

Sort of like this:

Lure is pretty ineffective for drawing otter to a set location, except to maybe slow them down a bit at a toilet set location. In that situation I will use whatever type of lure I have with me; more as a curiosity lure than anything else.

The one i caught was a castor mound with Backbreaker.

If you have beaver channels, crossovers, or narrow places in small creeks a 280 or 330 size bodygripper is a great set.

BUT, if you just have a creek that is 15 t0 25 feet wide with no apparent otter location or otter toilet, and you know otter travel through the area occasionally, a baited pocket set with fresh fish (shad, blue gill, crappie head, etc.) or muskrat is an excellent otter set. Make a pocket set similar to how you would make one for mink or coon. Don't set the trap tight to the hole like you would for mink although it will work, unfortunately. Keep the trap 2 or 3 inches back from the mouth of the hole if you are targeting just otters.

Ask Gritguy about how otters respond to his squeakers. Otters do hunt by sound, especially when the fogs are chirping.
Also the sound of rippling water in little feeder streams. They may think it’s fish.

Mink gland lure works great. I think Otters hate mink.
Bobcat gland Lure works as well. Look up Billingsley Brand trapping lure on You tube. He swears by Bobcat gland lure.

The guys using my Shellfish Payback raccoon bait were catching so many otters on it, they made me put it on the label. I use fox hallows torpedo lure years ago but no idea if helped much if any.