Frieza was an Alien, so I don't know what "Alien form" is. Frieza had 4 forms, and his final form has different strengths.
What is "New Buu?" There is Fat Buu, Good Buu, Evil Buu, Majin Buu, Buu, Super Buu, and Kid Buu (and ubuu if you want to be technical).
Vegeta never went SSj2 in the...