If I could only pick one (between those two), I would take my F1.
For me, it would work better at my intended knife related applications (backpacking, camping, woods-bumbing). Longer blade, insulated handle, stainless (nice for the winter months). I've never needed the additional features the HEST offers. If I lived in the city or someplace those tools would come in handy, my choice might be different.
I think everyone who suggested keep the HEST and save up for an F1 is right on the money though. Both are great knives so choose the one that best suits your needs only if you have to choose. If not, get both.
Keep in mind you will get some biased responses asking this on the ESEE forums.