no matter what guild you go to, there is always 2 sides (2 guilds who are against each other)
Fighters Guild - Blackwood Company
Mages Guid - Necromancers
The Dark Brotherhood - ??? (if there is one i forgot)
The Blades - The Mythic Dawn
Thieves Guild - Imperial Legion

in oblivion you could choose 1 side, you have no choice.
im hopeing in skyrim they give you the choice to join which side you want.

do yall think this would be a good option? to pick which side you wanted to be on unlike oblivion?

Yes, I'd love that. I'd also love that if the factions were a bit more morally grey, instead of just having an extremely good side and an extremely evil side, have them mix and match, grey and grey morality and all that.

I bet that it will be a more Fallout kind of moral situation with your karma (or fame / infamy) being a bit separate from your standing with a particular faction, which makes sense. People are willing to overlook all sorts of weirdness and transgressions if you're hooking them up with something and characters should behave like people.

I SO wanted to join the Mythic Dawn in OB... So yeah. I want it so that you can choose whatever guild you want, but if you join one, certain others will be unavailable to you.

It depends I would rather have those type of choices in the quests then with the guilds.

Mythic Dawn would be impossible because then Mehrunes Dagon would destroy Tamriel so don't expect Alduin's Dragon Fanatics to be joinable or whatever the heck that faction will be called.

The Mythic Dawn was mainly just another example