Sorry, don't know anything about iPhone Enterprise distribution.
For BlackBerry, there are two 'variations' depending on whether you are talking BB10+ or BB7- phones. However in principle they are the similar, the BlackBerry Administrator makes an application available to the corporate BlackBerry devices associated with the corporate BES, and these can be pushed to the phone, or can be made available to the phone (for BB10).
A possible restriction here is that the application will only made available to BlackBerry devices associated with that specific BES.
There is more available from the link you have already found.
I think to give a more specific answer we need to understand what you are trying to achieve, and if this is targeted to BB10+ or BB7- devices.
Edit:
Since you have indicated that you are targeting BB7 and earlier, then I would recommend one of these approaches:
a) If you wish to force users to have your software, then the best approach is create a software profile on the BES
b) If the software is optional, then place it on a corporately accessible web server and OTA download as described by Nate. This is significantly easier to maintain than the BES distribution.