My suggestion would be always you should research more information before you get into it. So, that you can find a perfect solution for yourself. Here i have given few of the tools through which you can research your facebook competion.
Simply Measured
Ahrefs
SEMrush
BuzzSumo
SpyFu
Snaplytics
Social Ad Scout
AdEspresso
PowerAdspy
These are the three tool which i would suggest for facebook competition research. But you can find lots of tools over the internet.
best tool that i know or love to used its adsfeed
I can recommend some of the best tools for facebook competition research, from these tools you can pick one for yourself. the tools are Buzzsumo, Similarweb, Feedly, Mailcharts, Owletter, iSpionage
Poweradspy.com is the best Facebook ads spying tool. Well worth the annual fee. If you are interested, kindly PM me.
Woobox , buzzsumo, poweradspy are good tools for facebook competition research