Squirtle > Charmander > Bulbasaur
Chickorita > Cyndaquil > Totodile
Treeko > Mudkip > Torchic
Turtwig > Piplup > Chimchar
Oshawott > Tepig > Snivy
Froakie > Fennekin > Chespin 
Rowlet > Litten > Popplio

Aside from Gen 7 I am taking into account their evolutions too.

As for best to worst gen for starters
2 > 1 > 4 > 3 > 7 >6 > 5. 7 of course not being final seeing as I dont know their evolutions.

Gen 1
Most Favourite: Squirtle
Least Favourite: Charmander
Gen 2
Most Favourite: Chikorita
Least Favourite: Totodile
Gen 3
Most Favourite: Treecko
Least Favourite: Mudkip
Gen 4
Most Favourite: Piplup
Least Favourite: Chimchar
Gen 5
Most Favourite: Snivy
Least Favourite: Tepig
Gen 6
Most Favourite: Froakie
Least Favourite: Chespin
Gen 7
Most Favourite: Rowlett
Least Favourite: Popplio

1-Squirtle
2-Chickorita (close second Cyndaquil)
3-Treecko
4-Turtwig (Tough Torterra>>>>>>Empoleon)
5-All of Them.
6-Chespin
7-Popplio

Gen 1: Bulbasaur

Gen 2: Chikorita

Gen 3: Torchic

Gen 5: Tepig

Gen 6: Chespin

Gen 7: Litten (popplio is the best)

Basically yes. It's a flower sauropod.

yup, I usually just pick one one of them until I reach route 4 to catch Darumaka/Sandile, the first decent Pokémon in the game (usually I prefer to catch Pidove later on if he's my Fly user...)

Gen 1
Most Favourite: Squirtle
Least Favourite: Charmander
Comments: Squirtle evolves into my favourite Pokemon and I love all 3 Kanto starters, but BUlbasaur is a badass in my book so he's slightly higher than charmander
Gen 2
Most Favourite: Totodile
Least Favourite: Chikorita
Comment: Totodile is easily my fave here he is so cute and he turns into a badass, However chikorita... I like it, but its simply not my kind of Pokemon while i really like Quilava (cyndaquil and typholosion aren't higher than midform)
Gen 3
Most Favourite: Treecko
Least Favourite: Torchic
Comment: Badass the grows Leaf Blades and a chicken that fights... I really like mudkip's memes so that's the only reason it beast the chicken, but Im not a fan of torchic, never have been.
Gen 4
Most Favourite: Turtwig
Least Favourite: Piplup
HOLY HELL this gen. The first time I outright hate a starter Pokemon, That's right the dumb penguin. Like holy shit how do you make such a terrible Pokemon exist? Turtwig on the other hand is a badass with a continent on his back once he fully evolves.
Gen 5
Most Favourite: Snivy
Least Favourite: Tepig
Comment: I don't think I need to stay Much about this gen, tepig sucks Snivy looks cool
Gen 6
Most Favourite: Froakie
Least Favourite: Fennekin
Comment: Nothing is better than a ninja frog, while a witch fox is meh
Gen 7
Most Favourite: Popplio
Least Favourite: Litten
I hate cats, and i like water types and I like sea lions stop hating on Popplio!

I've liked all the starters eventually. I'd never use one, but they all have good designs.

Except maybe Typhlosion's line, which is mediocre. That's really it, though.

Gen 1: Bulbasaur
Gen 2: Totodile
Gen 3: Treecko
Gen 4: Turtwig
Gen 5: Tepig
Gen 6: Froakie
Gen 7: Popplio

Gen 1:
Favorite = Bulbasaur (Loved him and his mega in X/Y)
Least Favorite = Squirtle (Monotype and... I don't know, he just sucks)

Gen 2:
They all suck, but Cyndaquil and it's evolutions are some of the lamest looking Pokemon ever.

Gen 3:
Favorite = Mudkip (Looks awesome and I love Water+Ground)
Least Favorite = Torchic (I don't really care for either, but I'm putting Treeko ahead cuz it looks cool)

Gen 4:
Favorite = Piplup (My first ever starter! Super cute then super cool with Empoleon, and that unique Water+Steel typing was so good, resisted all the things!)
Least Favorite = Turtwig (Final evo is meh, and I guess I just don't like turtles)

Gen 5:
Favorite = Snivy (Still the sexiest Pokemon line!)
Least Favorite = Tepig (Ugly fat pig? No thanks!)

Gen 6:
Favorite = Froakie (I loved both it and Fennekin's looks, well except their final evos. Water wins it though!)
Least Favorite = Chespin (Worst final evolution of the bunch)

Gen 7:
Favorite = Popilio (He's grown on me!)
Least Favorite = Litten (Purugly gone emo)
This all could change when see their evolutions though.