Last year I sold my last mutual fund, and now only hold ETFs. But before that, I did not reinvest dividends. I prefer to decide where the money gets reinvested - usually to a bond fund, since stocks tend to pull ahead of bonds over time. It's also easier to avoid "wash sales", where your dividend gets reinvested in a fund, and then you sell that fund for a capital loss.
(Non-REIT) Stock mutual funds tend to issue dividends quarterly. So another way to decide is based on how often you login to your account, to buy/sell. If you do that every few weeks or months, that's often enough to do it yourself. If you login 2-3 times a year, maybe the convenience of reinvested dividends is worthwhile.
How about you try without reinvested dividends for 4 months (Mar & June dividends), and see what you think. If you don't like investing the dividends yourself, you'll find out and can switch the setting.