in terms of battling MMM is the best since it does the most icons for about the same price.
H4k is probably the best investment. And I'd only get Fpot if you can't afford a MMM.
H4K isn't worth it anymore. Save up a couple hundred K and get the Fpot, or the MMM if you really want that added icon.
While it is three icons against two; physical gets blocked easily, unlike water which gets through gshield
I agree with the less blockable water, I bought a FP recently and I'm happy with it.
last time I checked the TP (yesterday), people were asking for 500K NP more for the FP than the H4K. I'd certainly consider trading up to the FP if I could find anyone willing to do so for only 200K (I have an H4K now). Oh, I agree, the 2 water is better than 3 physical, given how many shields will stop the physical from doing anything.
Since the cost per icon isn't a huge differance between h4k and Fpot, I'd say the potion is the better deal. I'm biased against MMoM because of the physical though. If you're strictly 1p, go ahead with the marbles
I prefer the fpot best for the same reason people have already pointed out...2 water icons. It's rare to see a tabard used first turn anyway, whereas gshield is by far more popular.

But I'm mainly a 2-P battler, so that's all I considered ^^
When I thought about it, 3 physical was greater than 2 water, because I figured most people use a freezer+multi use first turn. Didn't think of freezer+gshield, since I guess I personally don't use a gshield and most often see either a PCC, SoS, RoTL or other dual duty/pure atker +freezer.
Yeah, I'm with Q on this, I rarely see people play defence on the first turn unless they're running HBT (which shuts down F-Pot, interestingly enough). It's virtually always Constant + Freezer... In which case raw icons are what matter. And MMoM can be stacked with any of the gazillion physical constants out there to overwhelm the physical defence of G-Shield/F-Tab. Not going to be running into too many first turn
Yooyuball Keepers Chest Guards, are we? (I just did, spectacularly enough :K)
I saved up the spare NPs to transform my H4K into a FPot (via TP). I think I will do the same thing for MMM. True, though that Physical is the most common icon.