Not unless you load an amount you can handle in one hit. I've owned one for a long time and have never used it as a one hitter. You can easily get quite a few hits if you load enough.
If you're going to post a recommendation people please stick to the 'either/or' choice that the OP provided.
Sure, you can take quite a number of hits in succession and certainly have a session (or more) with a battery and a trench. This is what I typically did with my box.
However, the power is only applied when pressing in the battery and at that point, it is immediately available for hitting. Whereas many other portable, such as the Solo and the Pinnacle, one powers up the device, waits a few minutes and then one simply hits it as power is constantly being supplied. This power-up style Pakalolo calls session style and the apply-heat-and-hit-it style like the MFLB, Palm, etc Pakalolo calls one-hitter style.
The former style
encourages sessions and the latter style
encourages hits. In other words, with the Pinnacle, once warmed-up and so easily giving constant power, I expect I'd easily find myself taking hit after hit, really comprising a session; whereas, with the MFLB, I probably more easily hit it and quit it - grab it from my pocket (loaded trench), take a hit or 2, and think, I'm good. Perhaps a bit later, I'll take another hit or 2. This is easier (or at least following the design principles more) with a one-hitter style portable like the MFLB versus a session style portable like the pinnacle. One can certainly have a good session with a loaded MFLB and again, this is how I primarily used it. Which is partly why I'm somewhat confident that I won't miss the one-hitter aspect of my MFLB once I receive my PNP. I like sessions. (Anyway, I have my concentrate pen for an ultra-portable one-hitter).
I have myself only recently given thought to this session vs one-hitter style differentiation (with Pakalolo's post) and it's all only imo. Yeah I recommended the Solo in my previous post, but otherwise I think my central point about session style vs one-hitter style portable applies to the OP's request for comparisons of the "pinnacle" and the MFLB. My mentioning the Solo was simply to highlight the difference typically between the ease of use of session style portables vs one-hitter style. Having used the MFLB and the Solo - but not the PN - I felt confident recommending the Solo over the MFLB based on ease-of-use (noob appeal).
OK, done rambling. Off for a walk with my pen.
EDIT. Did you read Pakalolo's post?