The only experimental I have used is RU. I have used fluridil, but that's approved in the Czech as Eucapil. Both provide itch relief, but RU is definitely much more powerful. With fluridil the itch will come back a few hours later, whereas with RU twice daily the itch is almost gone. I forget the actual binding affinity of fluridil, it might have been something like 1:40? Though I believe that half life might be longer. I have seen more success stories on RU and virtually none from fluridil aside from reports of reduced itch. I haven't experienced side effects from either, side effects are supposed to be generally low for both, but side effects from fluridil are extremely low (the compound is hydrophobic and designed to breakdown upon contact with the serum) and might be something to try for someone who has issues with RU. Both dry fairly quickly. RU might take about 5-15mins and leave a little residue once it dried (this might be due to the carrier) but you can easily brush it out. Fluridil is an isopropyl based topical, and dries very quickly, leaving no residue at all. Apparently some have complained about scalp dryness on it, which is no doubt due to the isopropyl, but that might actually be desirable for those with an oily scalp. It depends how much you use, but they will probably cost around 60 bucks a month for either.
CB is supposed to be a several times weaker than RU but still more powerful than fluridil. However, unlike RU, CB is steroidal and can cause HPA suppression, so it might have to be cycled. Despite this, it is supposed to have a low incidence of side effects. The only real success I have seen is from Duterino, but he also had very, very minor hair loss. He said RU gave him sides but that CB didn't even while at super high dosages. I forget the exact price of it but it might be about 100 a month. This is something that you would consider if 1. RU gives you sides 2. Fluridil is not powerful enough 3. you are willing to dole out that kind of cash.
Then there's alfatradiol, which is basically a very weak form of estradiol, and I see this as possibly counterproductive because it is obviously even weaker than endogenous estrogen. Supposedly it is even considered a weak 5ARI. I don't know of any success stories on this, but I believe the side effect profile is very low as well. To me it's not even worth trying.