Yeah, the Cherry Ergo Clear won’t wow you at the outset… keep in mind it was all people had for medium-tactiles in MX for years…
It will be scratchy and somewhat wobbly. Honestly, if you want to be ‘wowed’ by an MX Clear, it’s best to give it a powerful spring [lots of options here], lube the housing pretty heavily, and maybe film it.
Bonus points for wearing in the Clears before doing all that.
The difference between the U4T and the U4Tx is that the U4Tx is semi-dampened. So it’s a U4T that is quieter on the upstroke.
The U4 Boba feels mushy because it is a fully-silenced switch. So it has a fair bit of dampening.
The U4T is actually based on the U4, which came before it. The U4 was a very popular silent tactile when it came out, as it had a then-novel ‘D-shaped’ bump, kind of like a Panda but not entirely. It was cheaper and had some other features over the competition at the time. Still a benchmark silent-tactile.
The U4T capitalized on the U4’s popularity by offering a non-silent version of the U4 Boba, being similar in stem-profile. It was kind of like a Panda stem, but in a much cleaner and more sturdy housing. Overall, the U4T is probably more steady, more consistent, and more refined than a Holy Panda. [But if you want the full Panda effect, you can put Panda stems in a Boba housing, which I personally enjoy.]
The Aflion Melody should be interesting, as it is a light or medium-tactile, probably in the range of the Blueberry Chiffon.
The Gateron Root Beer Float are fairly popular. It’s my understanding from the review that they come unlubed [for customizers,] which means you or somebody will need to lube them for best-results. [Don’t try this with 205g0 if you are new!]
I guess it’s T1 derivatives and some other switches left for you to try. You’ll have tried most of the major designs at that point.