Been using GDATA on my personal work computer for over a year now. Latest versions are gradually getting lighter than previous versions. Avast!.... I like it but as others have stated, kinda pushy and gathers way too much information.
avast is way more intrusive in terms of promoting other products . i have another problem with avast in terms of privacy. have read some fishy things about it and will stay away for a long time unless it changes.
gdata is heavy,,, in fact i would say it is very heave but it is safe and privacy friendly . i like it better . simple and user friendly .