Bitcoin SV is a hard fork of Bitcoin Cash, so we must first understand a hard fork and why it happens.
What is a hard fork?
A hard fork is when single currency splits into two currencies in simple terms, If you own the single currency beforehand you will own the same amount in both after.
In this case you would of made around 40-60% profit from the fork. Because if you owned say 1 Bitcoin cash ($200), after the fork you would of owned 1 Bitcoin cash ($200) and 1 Bitcoin SV($100). This was calculated off late 2018 prices.
So from this point you could chose to keep both, sell both or just keep the one you like the features/team and a range of other things you find the best choice of investment and currency.
Hard forks normally happen for a few key reasons.