G Data is pretty light now.. It is slower in some cases loading larger directories but otherwise feels pretty darn lightweight. Not as light as Norton, which is featherweight, but still very light IMO.
When I bag on Norton it's mostly because of raw numbers. As I said in another thread, Norton has a HUGE footprint, so we're likely to run into it more and that includes more infected machines. 90% of every machine we see are Avast, Trend, Norton, Microsoft, Bit Defender.. In thousands of malware removals a year I've never actually ran into a machine with G Data, Dr. Web, Emsisoft and F-Secure on them. Only a few Kaspersky boxes, and some ESET systems. We've seen some tremendously infected ESET machines as well, including an entire company ransomwared with ESET blissfully unaware.
IMO, Norton excels at: Lightness, Anti-Exploit, Anti-Phising and Firewall. The firewall is one of the most powerful software firewalls I've ever seen and is exceptional at preventing lateral movement in a network from worms and such. Norton when tweaked above Default actually starts to become pretty strong. The problem is, nobody tweaks it's sensitivity, heuristics and insight beyond default, but they should. Also note, I personally feel Norton's mobile security is one of the best Android security offerings out there.
So even though I am harsh on Norton at times, I still think it's pretty much the best US AV out there. It's certainly priced amazingly well. Norton just sent me an email offering 10 licenses for 1 year for $30.. I mean seriously, that's a great price for that many devices and way way below boutique suite pricing. One could always couple Norton with VoodooShield and Heimdal and probably have a stunning security system while saving a ton of money over boutique suites.