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This SciFi StackExchange answer has a good explanation:

http://scifi.stackexchange.com/a/90394

Essentially, Fox owns the rights for X-Men and Deadpool is an X-Men universe character. Fox and Disney have different views on rental and sale windows.

Age of Ultron is not available for rent because it is on Starz. This is similar exclusivity deal but with traditional premium TV channel. This happens with most movies. They are available for rent for a while on streaming sites, then can't be rented when on pay TV, and finally can be rented again after year or two.

I recently digitally rented Avengers: Age of Ultron on VidAngel. https://www.vidangel.com?vip=yvkbv6kw

I love the $1 SD or $2 HD rental VidAngel offers on latest DVD releases. Not sure how long this will last though.

Despite Deadpool being a Marvel property, the movie itself was primarily produced/distributed by 20th Century Fox, so it's probably just different licensing between different companies.