Reddit didn't have a third party app (just the compact and mobile interface) when I used it, so I picked up an app and never left.
I mostly use Alien Blue and Apollo, both of which are almost certainly on the chopping block. I tried the official Reddit app for a little bit, but my iPad Mini 2 is too old and slow for it, so it tends to crash almost instantly, or run rather poorly.
On my phone, I started with relay, but moved to Redreader and Infinity, since they were open source, and have better performance compared to Relay. I still keep relay around for the message notifications, since they're better than the other two apps.