Here's a list of exclusives for PS4 and XBO, both timed and not timed. I'm leaving out DLC for both platforms so no Infamous First LIght or whatever that thing was from Dead Rising 3. Let me know if I missed anything.

PS4:

Bloodborne

LittleBigPlanet 3

Uncharted 4

The Order 1886

Let it Die

Entwined 

No Man's Sky

Ratchet and Clank remake

ABZU 

The Last of Us

Driveclub

Grim Fandango remastered

Microsoft:

Masterchief Collection

Scalebound

Happy Wars

Dance Central Spotlight

Sunset Overdrive

Project Spark (Conker 2?)

Forza Horizon 2

Inside

Halo 5

Shape Up

Phantom Dust

Ori and the Blind Forest

Fable Legends

Crackdown 3

Does either side have a clear advantage at this point?

It's pretty close

you forgot to list Halo 5 and Dance Central Spotlight btw

Sony. I just like some of the more well known IP's (LPB, Uncharted, R&C) so much! Microsoft's line-up is looking great, though.

As for the Conker thing, I think It's the normal game, but you're Conker (And control like Conker, maybe). It's better than no game!

Halo 5 and drive club are missing

The Ratchet and Clank one is more of a reboot.

You forgot Driveclub for Sony.

The most well known IP is Halo...

Project Stark is also on Personal Computer.

That shape up game is missing as well as halo 5. Drive club too although i do not recall seeing driveclub at sonys conference or even mentioned.

I was talking about specifically Sony IP's.