I've been testing Over Protocol for more then 7 month's and i got 75 OVER airdrop.... thry worth (15$)

But for VANA Testnet I've spent 1 day just for fun and i got 1.20 VANA. (32$)

Should i continue spending my time and focusing just on one protocol like i did with Over Protocol? F... Over Protocol 

It's great to see your experience with both protocols! Sometimes diversifying your efforts can yield better results. If VANA is giving you a better return, it might be worth focusing on that for now. Trust your instincts!