Gdata is excellent with BEAST and DeepRay which is its strength.
But I don't like the software because the interface is completely outdated and I had big problems.
Indeed, at my place and at a friend's place, Gdata made Windows crash completely when it couldn't start for obscure reasons!
You had to shut down the computer with the button on the central unit...
Bitdefender is very good, however, I noticed a slight drop in definitions... Even if it catches up at launch (its video will arrive after my 5 day weekend
)
Avast is excellent and provides a very high level of protection. One of the few to block the most recent variants of RedLine, SmokeLoader or Snake.
It also blocked artificially inflated files and also blocked an injection attempt thanks to its IDS module