It all depends on how you want to approach it really.
Both dribble and behance give you a rather easy tool to organise and advertise your works. Only real drawback as i see it in your list is "technical limitations" — thats what i mentioned as well, if you want to create a F-I class portfolio you will need your own web-site, but i would rather go all out on real projects, since obviously a single person isn't enough to sustain this sort of a web-site in the long run. But again, its a personal choice.
As for the "lack of control" — thats like saying that putting your money into bank makes you vulnerable. Sure its a risk, but i d like to see a person who isn't using debit card these days. Behance is up and running for like 10 years now, very few personal web-sites survived for that long. Mine surely didn't.
I ll mention pros and cons as well
- its hard to mess things up: there is no comic sans and basic layouts are very newbie proof. So i would definitely recommend this for a new designer.
- you works are reviewed by industry leading designers and are automatically submitted to participate in contests
- integrated job board
- you work have high exposure
- its super fast to add works so you can focus on real projects
- it won't go down if you forget to pay for hosting
- you don't need to do any SEO or programming
- its self-improving with new features added all the time
- you are becoming a part of nice and helpful community
- it can go down without noticing you. This can be solved by advertising a domain rather than a dribble link. So if dribble close all you need to do is to set different redirect.
- you need to be good to get dribble invite
- whenever you give someone link to your 3rd party portfolio that person will probably browse other people as well which may have negative impact (you can avoid it if you become a paying member though. Pro-site on behance for example). Still if you have a team behind your back (e.g you are a company or a full-time free-lance designer) you probably need your own website.
- it has some technical limitations, so you can't go all out 1920 pixels parallax with background video. Although some cases on behance are outright amazing even with those limitations.
Now obvious thing would be to have personal website AND behance/dribble but its really hard to sustain 3+ portfolios in different places.