Web 2.0s vs .coms for Default Link Power

This is something i've never actually figured out. Do web 2.0s carry any more or less weight (linking power) than a .com of the exact same specifics/metrics? Just assume the web 2.0 was, say, a .wordpress.com and in another reality we had the exact same site as a self hosted .com site. Everything exactly the same, content, PA, inbound links, etc.

Which holds more linking power when linking to another site?

My reason for asking is because I want to create two niche specific tier 1 blogs for my money site. However, these tier 1 blogs will be treated like they were a money site themselves, and therefore will only get hq content and high quality links going to them.

Eventually they'll link to my real money site and im trying to decide if I should make them on blogspot and wordpress.com or self hosted .coms on seperate hosts.

The way I see it is: If you had for example a .com with the same DA as the web2.0 sites (almost maxed out), it would carry a lot more weight since the 2.0s that we create have been recognized as separate entities within the larger network that their site contains. So they don't get as much value from the domain authority as they would from a regular .com. But this doesn't mean that the web2.0s have no benefit from this high DA. I think that a .com with low DA would give worse results than a web2.0 with identical statistics. But a .com with high DA would provide more value than a 2.0 property counterpart. Not sure this is correct, just my thoughts about it