Best for what purpose?
Ultimate accuracy is generally best with single point cut. But it costs the most and is only intermediate for durability.
Button is cheapest, least durable, but good enough for most purposes.
Hammer forging provides the greatest durability and is close to button in low cost. Some people claim it causes accuracy issues, but FN Herstal makes sub-MOA barrels with hammer forging by the 1000's - most of them are even chrome-lined too. So done right, it is a wonderful process, and probably the best all-around for anything that can settle for 0.75 MOA accuracy.
There is also broach cut, a mostly obsolete process still used by DSA. It is a cut technique but all parts are cut at once. Done right it's not far off from single point cut in its characteristics. But hammer forging is better in pretty much all ways.
The only reason you don't see more hammer forged barrels is because the forging machine costs over $250,000 so it's limited to larger, high volume manufacturers.
When I read the title I thought this was going to be a question about number of grooves, 5R design, polygonal, ratchet, etc.