SmashTunes is the best application for controlling iTunes and Spotify from the menu bar.
menu structure and artwork
album artwork
appearance settings
iTunes
Spotify
Control

Play / Pause / Next / Previous / Select / Play Artist / Play Album / Playlist control / Ratings

Play / Pause / Next / Previous

Display track info in menu bar check_circle check_circle
Hotkeys a.k.a. keyboard shortcuts check_circle check_circle
Rate tracks through the menu or by using hotkeys check_circle
Display artwork check_circle check_circle