It all starts with itemizing your particular needs. Things like:
- Laser or inkjet
- Money saving ink/toner refills or full retail or generic cart availability
- Speed
_ Size (related to desk space, tightness of paper path (tight path means won't work as well with thicker paper stock), cartridge capacity
- Initial Cost
- Color vs B&W
- Cartridge replacement cost (aside from cost per page, some won't want to spend > $500 to replace all cartridges)
- OS driver availability
- Network adapter requirement
- Fax requirement
- Scanning, speed vs quality & higher focal depth (CIS vs CCD sensor)
- Duty cycle, how many pages you print per month
- Minimum Print Quality Required
You can't have the best of all worlds, printers tend to be compared with like alternatives in cost or duty cycle and basic engine (laser or inkjet and color or B&W). Once you have a clear idea of what type you want you can look at the popular brands like HP, Lexmark, Samsung, etc, get model numbers of the ones that seem to suit your needs and google for reviews of that model number.
If you're lucky you'll see "shootouts" or similar where several in same class are pitted against each other, or at least a review site where same reviewer reviewed several printers (even if not all at once, at least there is an expectation of comparitiveness among them) over time. Since there are so many printers and so many needs, there's no one master 'site that is likely to have everything you want to see.
If you're not really picky, instead just hang out in the hot deals forum and as deals come along, look at the features of each and what others have to say about them (including 3rd party seller, site reviews like at Newegg or Amazon).