Define "almost equivalent"?
For me - android has some superior "primary" applications due to their added functionality.
Last.fm app - realtime scrobbling of music tracks on device played in many media players. The iOS last.fm app lacks this functionality.
Twitter, Dropbox, Instagram, Google Drive, Facebook, Box (and many others) which hook into the "share" functionality of the OS meaning any web browser, file browser, gallery, document creation software and more can "share" to other sources within any other application.
This is one of my favourite features of Android as I can be browsing pictures in my galley, hit share then "Instagram" and share a picture directly from my gallery which is limited to Mail, Messages, Twitter and Facebook on my iPad and iPhone. To do the same on iOS I'd have to exit the pictures app, fire up instagram, browse to the picture I was just looking at again then share it from the instagram application itself - a bit more cumbersome IMO, especially with large picture collections on device.
Another good use of the share functionality is via
Pocket. If I'm browsing and see an article I wan't to share to Pocket (which will sync across my iOS and Android devices) I simply hit "share" then "Add to pocket". I can then later read it on my iPhone, iPad, Nexus 7 or Galaxy Nexus.
Yes there are some great exclusive iOS applications (GarageBand is untouchable IMO) but the cross platform apps are either on a level playing field or (for me) better on my Android hardware.
Are there any specific cross platform applications you can show me that I'll be thrilled at on my iPhone which will make me cry using it on my Galaxy Nexus?