Dags are far more labor intensive, and far more expensive to produce (think $50/ea for a 4x5 daguerreotype vs $3 for a 4x5 tintype, just in materials costs!). They're also far more hazardous - if you do mercury-developed daguerreotypes, you're dealing with vapors of iodine and bromine (both very caustic to the lungs if inhaled) and vapors of mercury to develop (long-term heavy metal poisoning, liver/kidney damage, brain damage) if not handled properly. With tintypes, there are alternatives to using some of the nastiest stuff (cadmium bromide in the emulsion, cyanide in the fixer). And cyanide, well... unless ingested in sufficient quantity, it is not lethal, and it is much easier to protect yourself from in liquid form than vapors from boiling mercury pots.
There is the Becquerel-developed daguerreotype that eliminates the mercury development, but they lack the contrast and sharpness of a mercury-developed plate. They're also very time-consuming to produce. If you think you might ever want to do daguerreotypes, I would first learn tintypes, as some of the skills transfer. But you'll be on the hook for a lot less money should you decide tintypes and daguerreotypes aren't for you if you start with wet collodion (initial investment of say $1000 between chemistry and hardware vs $5000-ish for dags, even without a fume hood).