I would highly recommend Emsisoft over Gdata any day of the week & that's never going to change unless Gdata suddenly manages to overtake Emsisoft in all aspects of the AV. Emsisoft has a nicer GUI, is faster, has one of the best if not the best Behaviour Blocker. It also has extremely good signatures, the company are full of amazing trustworthy & good people & the protection components all work well - the Behaviour Blocker, Surf Protection, Firewall, File Guard are all fantastic.
Honestly in my opinion the top 5 AVs are:
1) Emsisoft
2) Bitdefender
3) Kaspersky
4) ESET
5) MalwareBytes V3 - this may surprise you but I have tested it several times & every time it amazes me how good the protection is.
5) There are also a few other AVs that could get space No. 5 though...
I wouldn't personally recommend Gdata when you can get all of these other AVs which I would consider as "better" overall applications for several reasons.