Thay all are dependable, they all are durable and they all are going to breate just fine.
I have owned Scubapro Mk10, Mk25 and Aqualung Legend and Mikrons. My Mikrons are my go to regs, especially for travel. And service is available from any aqualung center worldwide. The only downside, and any of the smaller second stages will have this problem, is that exhaust bubbles may pass over your vision.
I am not saying to buy the Mikron. I am saying the all your choices will meet your criteria. So then it is down to features...
1) For the Mikron, its small size and lightweight is a feature.
2) Until the 2018 update, the octo was the same regulator as the primary but now the primary is standard with ACD. I don't know the the octo has that feature.
3) Then there is the ACD feature if that is i important to you.
4) And last is the inhalation effort adjustment knob for both seconds. I like this feature.
I have owned Scubapro Mk10, Mk25 and Aqualung Legend and Mikrons. My Mikrons are my go to regs, especially for travel. And service is available from any aqualung center worldwide. The only downside, and any of the smaller second stages will have this problem, is that exhaust bubbles may pass over your vision.
I am not saying to buy the Mikron. I am saying the all your choices will meet your criteria. So then it is down to features...
1) For the Mikron, its small size and lightweight is a feature.
2) Until the 2018 update, the octo was the same regulator as the primary but now the primary is standard with ACD. I don't know the the octo has that feature.
3) Then there is the ACD feature if that is i important to you.
4) And last is the inhalation effort adjustment knob for both seconds. I like this feature.