That looks like a totally diffrent attie with the F logo rather then Dingy scrawled across it, whats up with that? I like the looks of the F logo one.
The Stumpy is better then the 3.1 for a lot of reasons IMO but the first is the flavor. Its just BETTER off a Stumpola IMO and I fancy myself a pretty good builder. Secondly IMO the Hobo quick disconect tech is stupid, the airflow should be holes rather then slots on such a small attie IMO and I think the quality of the Stumpy is a bit better to. There very similar atties, I had both and I was going to keep the better one. The Stumpy outshines it in everyway. Im doing ni200 in my Stump right now and I am buying another one for ni200. When I buy an attie and get another one its an AMAZING attie. The only other attie that I have used that I could say is on the same level flavor wise is the Marquis. It also puts out decent amounts of clouds for the style of attie. If you like HUGE MUTATION X airflow and MASSIVE clouds its probally not for you. Im doing a dual 30g .08 started at 410 and really likeing 440. 60w. The Stumpy has even made me like ni200 wire. The flavor is just insane.
I understand the funds issue Heisnberg but when you can get one you should. Or try to find one used, I think I can tell what you like haha and I really think the Stumpy would check the boxes.
On another note, Petri is an amazing attie. I think it works best for bigger (as in LONGER) coils so I ripped out my build and slapped in some spaced 24g Royal Wire.