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Gear choices are very personal and since I don't know you I would never recomend you do anything. What I will do is pass along a question I was asked that was part of the decision process I used when I decided whether or not to go with Octo/power inflator combo. It is a question I had not considered before being asked and something that I suspect many new divers haven't considered.
In the event you have to donate air to another diver, there is a good chance they are going for your primary (tunnel focus on getting air at that moment). I would say the chances of that increase if you have the combo octo because it doesn't look like a reg and is not where someone panicking is going to expect it to be. Thus, you will have to surface, possibly dealing with a panicked diver, while breathing through your octo. Are you comfortable doing so with that set up?
That is not the only factor to consider but it was a good question to ask myself when I was making the decision.
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