I would have a hard time deciding that I have to choose between Hal and Malmi, although most people have great sympathy for Hal Finney who unlike Malmi remained on the forum until his death. Without diminishing Malmi's merits in the very beginning for Bitcoin, I think it's a shame that he distanced himself from the forum he actually created.
Maybe Malmi was a lot more like Satoshi when he decided to move away from Bitcoin, which is somewhat understandable.
Agreed. They are both giants.
Hal worked on cryptocurrency methods before Satoshi, and was the first public supporter and first public transaction.
Martti filled a crucial period. Hal was active until late Jan 2009 and then again nearly two years later, where Martti was active after Apr 2009. Martti helped establish this forum, rewrote parts of the website, learned to code, did debugging and porting, was the first public exchange that we have proof of in late 2009 and then later.
Without either of them, it may never have gotten as much traction.
Martti might be around to speak for himself, but possibly not. I can imagine that he left the community after being burned. It's only a guess from my end. He had an bitcoin exchange where he was using paypal for bitcoin transactions in 2010, and bitcoin was just becoming serious money. Serious enough (pun not intended) to become the targets of scams. Users could have reversed their paypal transactions and cost him money. Between that, wikileaks accepting bitcoin donations, Gavin's CIA visit, and other things, it's a no wonder that he moved away and is reasonably quiet about most of it. I hope that we can one day hear more about what he'd like to say because I'm certain it's very interesting and more in depth than what we've heard so far.