It's usually better to buy the coin before the burning since burning is done in the first place to reduce the supply so that the price of the token/coin itself would rise up
This is not the case of shitcoins.
I just wonder why they need to have big supply and then burning it when they one first hand itself, can create a coin/token with less supply?
Burning is for deceiving and definitely not a progressive related action for a development of a coin/token.