I don't find any good reason for buying MicroStrategy stocks because they got Bitcoin on their Balance Sheet. MicroStrategy stocks are far different from just buying Bitcoin.
You should buy MicroStrategy stocks for other reasons too, not just because they hold Bitcoin too. If I will answer the question of buying MicroStrategy stock instead of Bitcoin, I'll go buying Bitcoin alone because it's where I believe on. And for me, it's risk that they are on debt just to buy more Bitcoin.