Pardon my ignorance or maybe I missed it, how much are you willing to budget for dosing exclusively?
Hand dosing vs auto dosers comes down to budget and convenience. If your work schedule is hectic and erratic, I would suggest auto dosers. Yes, they are more costly up front, but think of the end game. Your corals will be healthier and happier with less risk of over dosing. After all, what's $250 when you made your $3k in corals look spectacular and little risk of loss?
I highly suggest auto. Nowadays, you can buy dosers for under $100 like Jebao DP-4 and some Voss glass bottles (drill their caps) as containers for the frugal reefer. All and all under $200.