You can easily compare ships. Filter by Tier and Faction, and select which group of stats you wish to see. By default, all tiers for all factions are shown. You can also filter by category, and compare up to four of categories at a time.
These results are queried directly from this Google spreadsheet (which contains additional info and formatting): http://bit.ly/STOShips.
Tier:
Faction:
Show Stat Group:
Category 1:
Category 2:
Category 3:
Category 4:
Have you found missing or incorrect stats? Tell me about it on the STO Forums.