I use the Opera labs browser. Opera, because despite some parts I don't like, it's the best I've seen at reflowing text to fit the screen (perfect for HN). The labs version, because it supports extensions, and it is the only way I can get something like Ghostery to block trackers while I'm browsing on the phone.

Do you have a particular HN app you recommend?

I was using http://ihackernews.com for a while, because of its mobile-friendly HTML, but it doesn't really offer anything in addition to regular HN with a good browser. Double tapping zooms to a good size, reflows the text, and snaps the scrolling to the new width, so most sites just feel like a "mobile app" anyhow.

Cheers.