Choosing a bathroom faucet involves a few steps:

Pressure - GPM or gallons per minute - with greater pressure you can use a wider head

Style - is it rounded  or more square - uniformity among all the faucets and towel bar holders are nice

Finish - Chrome -  easiest and most cost effective,                                                                                                                                          - Brushed - higher end look - handles finger prints better  -  more expensive