So my question would be, which one is correct?
On the forum we all go by a certain exchange price so what was the highest price BTC rose too yesterday for the true near ATH?
Different exchanges will have different ATH for Bitcoin and coinmarketcap, coingecko, other sites have their own formula for Bitcoin price calculations too. It's hard to say what ATH is correct because it depends on formula used for averaged Bitcoin price across exchanges or what exchange you want to say about ATH for Bitcoin.
This is not a direct answer, but it says a same thing like my opinion.
Bitcoin Price History Chart (Since 2009). It was not updated recent years, but let's skip it, I only want to share information in the quote, not about price.
What is the Current Bitcoin All Time High?
The Bitcoin price all time high will depend on which exchange you reference.
Bitfinex is the largest Bitcoin exchange, so it's all time high of $68,958.00 per bitcoin is the most referenced all time high.