Budvar with alcohol tastes of nothing too.
Their market share in Czech Republic has hugely deteriorated in the last 15 years and you rarely see it in pubs these days outside of South Bohemia and Prague. Generally you don't get anything like the variety of beer on tap that you get in the UK though, rather than 8 random different ales and lagers you'll just have a 4% and a 5% lager on tap and maybe an IPA/APA. I think that helps ensure the pubs are serving a quality pint because they get through their kegs quickly.
Some of the Czech Nealko’s are good though, Birrell is Pilsner Urquell's version and it is probably the most popular, Bernard Free is also good. In the 0% market, what has grown in popularity is the 'radler', essentially a non alcoholic shandy made from beer and some fruit flavour e.g. lemon, orange, grapefruit.