Three separate things get mixed together under that phrase. First, the login format: Xtream Codes (a username, password, and server address) or an M3U file (one long playlist link). This decides how your app fetches channels and the program guide. Second, the delivery format: most services send video as HLS — short segments of roughly six seconds each — while some boxes take a continuous MPEG-TS feed instead. Third, the compression codec: H.264 or the newer HEVC. People asking what the best stream format is usually need an answer to just one of these layers, and the right answer differs for each. The next sections take them one at a time.

For most people, yes — because of what happens after login. An Xtream Codes login fetches your channel list, VOD library, and EPG (the electronic program guide, the on-screen TV schedule) as separate live requests, and it re-authenticates each session. Change something on the server and your app sees it. An M3U playlist is one fixed file: simple, and it works in almost anything including VLC, but the guide often needs a separate URL and the list updates only when the file is re-fetched. Use Xtream Codes in TiviMate or IPTV Smarters when your player supports it, and keep M3U for basic players or quick tests. Most services can hand you the same account in either form.

At the same bitrate, HEVC wins; at the same picture quality, HEVC uses about half the data of H.264. That's the whole trade. A 4K stream that needs 15-25 Mbps in H.264 can land the same detail in HEVC at roughly half of that, and hourly data use drops the same way — from about 7 GB per hour toward 3-4 GB. The catch is decoding: HEVC asks more of the device. Recent Firestick, Apple TV, Android TV, and Roku hardware decodes it without strain, but an old stick may stutter on HEVC while playing H.264 fine. If a channel offers both, pick HEVC on modern hardware and H.264 on anything older.

Bitrate follows resolution and codec, not the login format. Plan on 15-25 Mbps of steady throughput for 4K and 5-8 Mbps for 1080p, with data use of roughly 7 GB and 3 GB per hour respectively. HEVC roughly halves those figures. Xtream Codes versus M3U changes none of this — the video bytes are the same either way. What the delivery format does change is how failure looks: HLS arrives in short segments, so when the server falls behind for longer than your buffer holds, you see a freeze rather than a gradual blur. If your line clears 25 Mbps wired, format is never your bottleneck; the server's capacity at peak hours is.

Match the format to the player, not the other way around. On Firestick and Android TV, use Xtream Codes inside TiviMate or IPTV Smarters — you get the guide and VOD lists without extra URLs. On Apple TV, the same login works in the players that support it. MAG boxes are the exception: they use a portal address tied to the box's MAC (its hardware ID), which the provider registers for you. VLC on a computer plays a plain M3U link but shows no guide. Kodi sits in between, with add-ons that accept either. Whatever you run, setup with a working login takes about five minutes.