The High Elves, or Altmer, arrived in Tamriel thousands of years ago from Old Aldmeris. They see themselves, perhaps justifiably, as the ruling race of Tamriel. They are a highly cultured people, known for their breathtaking architecture and massive libraries of histories and creative works. They tend to be isolationists, largely remaining on Summerset Isle, and only emerge when they perceive a great threat to their homeland. They are powerful mages and warriors, and the de facto leaders of the Aldmeri Dominion.
The Wood Elves, or Bosmer, are mischievous, curious and nimble. Because their homeland of Valenwood is often attacked by the Colovian Imperials, Wood Elves are experts at the art of defense. They are also gifted archers, perhaps the best in all of Tamriel. The capital of the Aldmeri Dominion, Elden Root, lies in the heart of their homeland. It has evolved into a center of political and cultural importance and is of vital strategic importance in the battle to control Tamriel.
The population of the proud feline Khajiit has dwindled in recent years following a devastating outbreak of Knahaten Flu. They owe a great debt to Ayrenn, Queen of the High Elves, for her help in restoring order from the chaos that followed the plague. They have a wry wit and a hedonistic outlook, but they are fearsome on the field of battle. They are the strong arm of the Aldmeri Dominion.
For me, it just has to be Wood Elf. I really look forward to seeing what they do with Valenwood. I would hope it will be expansive and open to exploration.