It would depend a lot on how many items you intend to link to in a side menu or tab bar. A tab bar is advised to contain no more than 5 links so if you can contain yourself within that limit go for the tab bar.
Displays no more than five tabs at one time in a horizontally compact
environment (if there are more tabs, the tab bar displays four of them
and adds the More tab, which reveals the additional tabs in a list)
Anymore than that then you should look at other days to display a menu (like the side hamburger menu you mentioned).
Only thing to note is if you do use the tab bar you will need to make sure your ad's are located immediately above the tab bar. But from my own experience that seems to be the most consistent place for them as to not distract from the navigation.