I've never had any stuttering/ dropping frames with my 2nd gen
Firestick. As I've said, there's a few channels on my IPTV that buffer (not necessarily HD ones: most of them are good). But apart from that, everything runs perfectly. And I use it to source video from quite a few sources: other PCs on my LAN, all the TV catchup players (eg. iPlayer), Amazon, Netflix, the freebies I've mentioned above. And my stick is over half full with stuff. I've not really used Kodi on it much: I have installed some Wookie build on my Kodi and that's turned out to be rubbish. But I do have good internet bandwidth.
I'm just amazed how good it is, especially for the price.
Incidently, going back to the OP. You can stream from PC to any Android device using ES File Explorer and a media player. Even my ancient Nexus 7 works fine that way.
Another thing to consider: the
Firestick is a WiFi only device (ie. not wired ethernet). My stick is less than 2 feet away from my main router. So, hopefully, a good connection. If yours is a fair distance away, it'll suffer.
One main disadvantage with the
Firestick & IPTV: there's no real pause/ wind back a bit/ record. I miss that.