Playstyles

There are different kinds of how to play Scrap Clicker 2, many playstyles.

Auto merging
Auto merging is one of the two biggest, together with speedmerging. It is also the most used playstyle. Players doing this one usually keep idling while the Ad Event Auto merge and sometimes use x100 scrap, x100 Bricks and x2 Magnets too. It's way slower than speedmerging, because it only does 450 merges avg. in 10 minutes.

Speedmerging
Speedmerging is the most efficient playstyle and one of the two most used together with auto merging, but being the second. It's actually just spamming the Faster Barrels Ad Event, some combine it with x2 magnets. Others aren't useful: x100 bricks gives many bricks, but after some faster barrels the bricks which were got in that x100 bricks are nothing again, same for x100 scrap. More Fragments isn't good in general, but Crazy Storm is used in this playstyle by some too. Depending on the player's speed, the best merge up to almost 4000 merges in 10 minutes. The average speed is ~1800 merges.

Chilled continuing
Chilled continuing is a pretty mixed playstyle and not used much anymore, but it was the second most used after auto merging in the past (2017 / Early 2018). It's just a mix of all ad events; Faster Barrels, Auto Merge, x100 bricks, x100 scrap, Crazy Storm, x3 Level Ups and the others. It's similiar to Auto Merging, but the difference is that this one doesn't focus on just one Ad Event.

Faster Level Ups
This one was introduced with the Ad Event Faster Level Ups, which increases the speed of level ups by 300%. The player has to merge by himself and still only gets ~450 merges in 10 minutes, the difference of this Ad Event to Auto Merge is that it makes Level Ups more efficient. Anyway, Speedmerging is more efficient than Faster Level Ups in terms of Magnets and much more efficient in terms of merges.