First off, the Super Tinker looks like a "no brainer" - a more useful SAK, gram for gram, is impossible to imagine...
Whether you pick a single layer 111mm or something more fun like a Fireman is only for you to decide. The single layer is obviously going to be cheaper but with no openers, it's a bit limiting. It's nice to have a simple knife for times where, if you ruin the blade, it's not the end of the world - but it's also nice to have a SAK that let's you pop the lid off a beer bottle or prise the top off a tin of paint. Personally I favour 2-3 layers - I think the Fireman is 4. If I really had to pick one and one only? I'd take a 3 layer Soldier/Trekker/Forester. From the 2 you mention I would go Fireman.
Anyway, have a fun time picking out the goodies from this selection!