Well... I voted I enjoy both and it is not far from the complete truth.
Oblivion was my first TES game. Imagine that I had never played RPG games before only Strategy games and sometimes FPS games here and there. Then I had been shown Oblivion. I started playing and never stopped playing TES games ever since.
Truth is I nearly voted Oblivion. The OP has good arguments in his points but this is also a matter of personal preference. I use Oblivion with Oscuro's mod it is so much better than Vanilla Oblivion.
Oblivion strengths.
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Cyrodiil is my favorite province. I like the lay of the landand the climate much better in Oblivion.
I LOVE the cities od Cyrodiil. Cities in Skyrim are nice but no match. Solitude while nice is by all means no match to the Imperial City. Whiterun is my favorite city in skyrim that is on par with Skingrad, and the other Cyrodiilic cities rest is not really.
The Guilds. I like Oblivion guilds more than Skyrim.
-Dark Bortherhood had my my opinion the best story line I experienced in TES. Skyrim DB while not bad it is no a same category.
-Thieves Guild Both Oblivion and Skyrim Quest line is very good a little edge on Skyrim TG here
-Fighter's Guild definitely the most linear quest in both but I like Fighter's guild more than Companions
-Mages Guild, Again Oblivion quest line is better, you had to do serious effort just to get in the Guild. I like the guild chapers in every major city.
-Arena was nice, I miss that in Skyrim
Main Story, In both games is nice but I like the Oblivion main story better
The mood and feel, both are good but I like Oblivion a little better
Equipment pieces, in Oblivion there were more pieces
Magic, In Oblivion there were more magical specializations
Skyrim Strengths
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Graphics - I believe there is not much to say
Voice Acting
Civil War background story (No side is perfect)
Radiant quests!!! Very positive in Skyrim Even if you are leader of DB or TG you get missions. Same with bounty on bandits.
Thieves Guild questline, it is the only one that surpasses the Oblivion peer.
Combat is better.
Equal
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Levelling the character is different in both but good in both. In the beginning character levelling in Oblivion was atrocious but Oscuro's mod solved the issue.
All in all I like both I would love to see Oblivion redone with Skyrim engine. Maybe a DLC about the Great War or Cyrodiil in 4E201 just doing the guilds again etc.