Easy answer. I would continue to hold GBTC. I would rather hold the stock than the bitcoins itself. And since I think GBTC will always trade at a premium to the Bitcoin, why wouldn't I?
I will probably hold both as I do now. $GBTC is much easier for me to trade in and out.
I have not figured out the tax implications of Crypto trading. I would hope that CoinBase will provide a downloadable file that can be processed by TurboTax Premier easy peasy.