I adore Ralts. Easily one of my favorite mons of all time. It's precious, has a pretty simple and nice looking design, has a cool cry, and its final evos are a couple of my favorites in the series.
I love Tauros. One of my favorite Normal types, cool design, fun to use sometimes, overall great.
Don't see that comparison hardly at all. Wooper and Mudkip, yes, because they're both axolotls/mud fish with similar design/species features. But Seismitoad is just a frog/toad that happens to be...
I like Dewott. It's got a cool design, a cool theme, and is imo one of the better middle stages. Actually I like it much more than its evolution.
Who besides Mudkip and Wooper + Quagsire are you referring to?
Allergic as fuck to Ice types, and really slow (which makes its weaknesses easier to prey on)... but otherwise a very solid design and concept. I like it. It's probably the most challenging of the 3 Sinnoh starters to use and that's respectable I suppose.
Swampert, my first and favorite starter