It depends on what you like and how much you're willing to spend.
Almost every low to mid grade amateur should be using a surlyn two-piece ball because of durability and cost. "Two-Piece" means it has a solid core covered by a tough outer cover. Surlyn (a DuPont trademark) is the most common material for that tough outer core. The alternatives are
Wound core, which is a small amount of something in the center, surrounded by a long rubber band. Wound balls used to be demanded by better players but now are almost dead.
A balata cover is softer, so it catches the club and spins better, but it's much easier to damage.
There is quite a bit of variability in the hardness of the ball, there's no best answer, just personal preference. They're rated by a "compression" number, which is 90 for most, 100 for harder balls and 80 or sometimes less for softer ones.
I like 90 compression Titleists because of how they sound when I putt. That's not a really good reason, but it's as good as most reasons. I also like Pinnacles because they are cheap Titleists. (They're both made by Acushnet.) Wilson ProStaffs are similar. TopFlites (often known as "RockFlites") and MaxFlis have a reputation for being somewhat harsher, but are often preferred by big hitters. I generally use whatever I found in the woods while looking for the new $3 Titleist that I just hit in there.
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Best ball is a tournament format where teams of 2-4 players play together. Everyone plays their own ball/game, and the best score made by a team member becomes the team score or "best ball". It is usually played as stroke play, but can also be played as match play. Match play often results in a lot of halved holes though. Handicaps can also be applied so that less skilled team members can also contribute.
Now if you meant "best Golf ball" that just depends on who you're talkin to. lol