I had a look at the launch D8, Hemingway, and mini 349.

All 3 have disc brakes and handlebars that fold inward instead of out. It makes the fold more compact but more fiddling to get it to fold. If you get grips with side handles, it may become impossible to fold, or maybe the latch on the handlebar may allow you to point the side handles vertically before folding. Maybe you can ask them to import you an outward folding handle post if you want one.

Hemingway and mini 349 were both 9 speed while launch was 8 speed. I don't think they can be upgraded to 11 speed because I couldn't see the 1.8mm spacer behind the cassette that would indicate compatibility for 11. So max would be 10 speed.

The Hemingway didn't have the deltec cable as pictured. So it's the older model. It felt heavier than the launch d8.

Hemingway has a strange boxy handle post hinge not seen on other dahon bikes but it shouldn't be a problem.

Launch d8 hinge was extremely stable. I could not feel any play . But I couldn't tell if that was due to the jaws or the deltec cable. In contrast,I could feel the typical play in the Hemingway and mini 349 vise grip hinge. But the pin in the launch d8 hinge is really thin compared to the typical dahon hinge. Perhaps the pin is more vulnerable when folded. But the vise grip latch of the Hemingway and mini 349 also has a risk of being bumped when folded .
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Mini 349 was much lighter and more compact, but the wheelbase is shorter by around 5-10cm. Also the rims have parallel spokes instead of the traditional offset spokes, which some people claim risks cracking the rim since parallel spokes apply more stress to a single point on the rim.

Mini 349 also has a 24mm crank spindle so it's easier to upgrade if you want a different hollow tech type crank. Both the launch and Hemingway have square taper bottom bracket, so if you want to switch to hollow tech outboard bb, you need to first shave the sides of the shell to get the surfaces parallel.

Strangely, the launch and Hemingway have one threaded hole on the left rear dropout while 2 on the right side, making one of the holes unusable. I have no idea why they did that. The mini 349 has 2 threaded holes on both sides, so you can attach a mudguard and rear rack into separate pairs of holes, while on the launch and Hemingway you have to attach then overlapping on a single pair of holes.

The positioning of the holes and rear disc brake on the launch makes it easier to attach a straight stay for the rear rack. The mini 349 and Hemingway may need a curved stay to get around the disc brake. The store stocks such a curved stay for the rear rack they sell, but I use a larger tern cargo rack for touring so that would need a custom shaped part to fit.

The mini 349 front disc brake position makes it easier to attach a front rack of mudguard. On the launch and Hemingway, you may need to bend the mudguard stay to get around the disc brake.

All 3 bikes have a single pair of threaded holes on the front dropout.

There were no markings indicating the rim with for the launch or mini. But the Hemingway was marked as 17C. The others could possibly also be 17C. Although my dahon bike from the European market has 19C.

If you want a stable hinge, the launch D8 is good but I have no idea about it's longevity.

If you want cheaper, the Hemingway was $100 less for an extra 9 speed, but slightly heavier and with a typical vise grip hinge.

If you want lighter and more compact, the mini 349 was $200 more than the launch, but comes with 9 speed, although also with the vise grip hinge.