Small creatures like giant spiders, wolves, bears etc are about man sized things that can usually attack but dont defend themselves. the rather simplistic AI will drive them towards the player but not much more. because of that fighting them is usually active and not too reactive since they can defend themselves very well if at all.
Humanoids are every creature that looks like a human being and is roughly the same size. these are probably the most sophisticated AIs in skyrim - they can usually do pretty much whatever the player can - block, attack, cast spells, run away etc. the fact that this AI can do more actions requires more reactive tactics from the player since he needs to be prepared for a more versatile reactions from the AI.
Giant beasts - these, in many cases have a simpler AI than humans (besides dragons, that might be pretty sophisticated according to legends...) but unlike smaller creatures they are really powerful and require more careful approach. melee options are probably less recommended. these creatures are usually a change of pace for the game.
what type of enemies do u like fighting the most in these kind of games and what are u most excited to be fighting in skyrim.
Also please tell us why?
![Smile :)](http://gamesas.com/images/smilies/icon_e_smile.gif)
p.s. - i know i didnt include an option for "all of them in a good mix". that's because i want ppl to chose. the "mix" option would probably be the most common one since it's almost obvious.