1.) 100 boost to health, stamina, magic
2.) stage 1: 25% resistance to normal weapons, Stage 2: 50% resistance to normal weapons stage 3: 75% resistance to normal weapons stage 4: 90% resistance to normal weapons
3.) The more you feed the stronger you get, the less you feed the weaker.
4.) Make feeding mandatory again (In DG they altered it so you don't have to)
5.) Paler skin, gaunter face (not like oblivion though), once you reach stage 3 you get claws, different eyes and cosmetic features for each strain.
6.) (For all strains) stage 1: 1 pt of sun damage per minute, Stage 2: 2 pt per minute, stage 3: 3 pt per minute stage 4: 5 pt per minute
7.) 100% Poison, Disease, and Paralysis resistance
8.) You can run as fast as if you set your speed to 400
9.) You can jump as if you set jumping to 300
10.) Different fortresses, for each major strain.
11.) Some sidequests where the different strains (covens fight each other)
12.) In every city there are secret underground safe houses, for you to feed and rest.
13.) You can make thralls.
14.) You can turn anyone into a vampire
15.) Vampire lords can actually fly (not to a outrageous extent though)
16.) You can lead raids on towns, and other covens to slowly take over the vampires
17.) Add more than one biting animation so you can feed, on your victims, neck, arm, hand.
18.) You can tackle someone to the ground and feed them if they are running away.
19.) If you feed on another vampire you lose health, but still increase to next stage.
20.) The more people you turn the more vampires you have in your fortress.
21.) Stages 1-3 your eyes look normal except at night or in dark areas.
22.) Stage 4, you go into a frenzy when your eyes change, and you look crazy. For every minute you don't feed you lose 4 health.
23.) You can feed on animals (like werewolves) but only gain half of a stage increase.
24.) Infinite water breathing.
25.) Night eye with life detect.
26.) If you feed on someone 3 times within 5 minutes they die.
27.) At night everything regenerates 75% faster.
28.) You can enthrall jarls to enforce your rule (make decisions more like you did n fable so they actually had a impact throughout the game.)

For werewolves,
1.) 50% resistance to all weapons but silver.
2.) 100 boost to stamina and health
3.) At all times health and stamina regen 75% faster.
4.) Increase speed, and jumping.
5.) Lunar transforms, and they day before you turn there could be cosmetic differences.