There are 3 massive things for me:
1. Aussie megaswill gives me a hangover - even one beer. I had one bought for me last year, and I thought "don't be a beer snob, when someone is buying", so I had it - it was fizzy and cold, and I enjoyed it. But the hangover next day - I swore off it forever. SWMBO swore off wine last weekend (after only one) for the same reason - euroswill and my beer (of which she partakes on occasion) "never gives hangovers".
2. I have had 2 cartons of euroswill and really enjoyed it. But I'd reckon my beer is more flavoursome. But euroswill and coopers is a really good tastebud recalibrator - we do get obsessed about hops in particular. I love a cold beer without overthinking it - so I come out the other end.
3. I'd love to brew massive varieties of beer - I reckon I read through BJCP at least once a month and often more. But with 3 kegs, and I don't drink much (and the effort to brew a small batch), I can't have a Saison, APA, Weissbier, Southern Brown, RIS, IPA, Best Bitter and Cider at the same time. So I default to my house beer, which is an APA. And let's face it I've converted some Megaswillers to APA with my house beer.
Goomba