Which Functional site is best for me. Please Advice

Hi Expert,

I am having 4 year of experence in SAP CRM Technical (Mostly worked on Sales, Marketing) worked on many project. Now i am looking to move into functional site(why i think - Getting fedup to Mind Scratch by Code logic). Please advice which functional Domain will suit me to make better future in Carrier as well as in financial way.

• I understand ppl will suggest CRM Functinal. but i am looking other domain which are best as compare to CRM Function regarding carrier building in future.
• I am fine with CRM too but want to have reason why i choose CRM function.

Please advice. 

Thanks