I have 5 jigsaws: Bosch top-handled equivalent of your 1591, the newest (2 yrs)
Trion Body-grip (5 yrs)
AEG hybrid handle and body grip (10 yrs)
Metabo body-grip (8 yrs)
Elu body-grip (25 yrs)
All have different strengths and weaknesses, which would be impossible to elaborate on without boring you to tears.
However, my favourite, despite it being the newest (and the one with which I'm least familiar) is the Bosch.
My least favourite, in fact the one that I absolutely loathe and detest, is the Festool.
Reasons for liking the Bosch: I can preset the speed AND still feather the speed on tricky corners with the trigger.
The lowest speed is lowest on the Elu and then the Bosch for really delicate materials like 3ply.
It has the best blower for clearing the cut line of them all. I often need to use the saw for site work, and don't really see the need for dust extraction at all. It's not "dirty" dust like drilling brick etc., and haven't really had any problems with the minuscule amounts produced in client's houses/business premises to date.
The blade locking and ejection mechanism is the best of them all.
I can go from cutting steel to aluminium to thick or thin wood or corners in a fraction of the time it would take with any other. The automatic lower guide adjustment mechanism is simple, intuitive and reliable.
It feels second only to the AEG in terms of balance and manoevreability.
The base tilting mechanism is streets ahead of all but the AEG, quick, easy and accurate.
Reasons for hating the Festool: It's predicated around dust extraction; without, it's messy and tends to throw dust into my face when cutting, rendering it useless for me as a site tool.
It takes way too long to change blade types. It's fussy, complicated, time consuming and I don't always get it right, resulting in either wandering if too loose or premature blade destruction through overheating if overtightened.
It doesn't seem to be as well balanced or feel as "right" in the hand as the others.
I concur with many other replies made so far. However I'd be very careful when considering some alternatives suggested. If I bought a Carvex (realistically unlikely given my experiences with its predecessor) I can imagine driving miles to a client's premises only to find I'd accidentally left the Accessory Systainer containing the bevel foot/baseplate behind! Many consider the Mafell Cuprex to be the very best Jigsaw currently on the market, but it has similar limitations (not to mention the price).
I cannot for the life of me imagine any circumstance where I'd be using a Jigsaw on a guide rail. Nor can I envisage the need to be making dimensionally critical cuts in material thicker than 2".
Bosch invented the jigsaw. They've been making some of the most innovative, if not the best available, jigsaws (and blades) ever since. It's their specialty, whereas Festool's particular forte is in sanders and routers. Bosch make terrible sanders, and pretty dodgy routers.
The case illustrated is made by Sortimo, and is in their "L" range. It's a similar, but incompatible product to Tanos, designed around an interlocking vehicular racking system. I personally like them a lot, and use them daily for my jigsaw, cordlesses, Kango Hammer and screws.
