There are many reviews on this site under ball manufacturers on the left.
The sonic x and boom are similar. But the boom is stronger, (more flare).
Sonic X is for very dry, and the boom is for medium light.
If you have a large arsenal get a sonic x. It will fill your dry lane spot.
If you are going to have an oil ball and a medium ball(lighter), get the boom!
REgards,
Luckylefty