I like poke champions like Xerath and Lux and I like to play Fizz now and then, but I main Ziggs because in my view he is so versatile.
He can poke, melt towers (often I took most or all tower kills), control paths with mines, bumb people or yourself to safety, nuke multiple people in team fights and what I also like so much are his empowered auto attacks in combination with his low CD bombs, meaning he has great burst and sustained damage. Ok, he doesn't melt tanks, but I often killed them with the sustained DPS when they were occupied by my team mates.