Your preferences are of course your own. Most of the advice so far is sound.
Take a look at 888bike.net [ english menu ]. I've used them on a number of occasions. Both your bikes are listed there at Bt6900, less on Lazada. Hydraulic disc brakes will almost always be better than cable, unless you need maintenance somehere out of the way like the Atlas Mountains. Any Thai shop can sort hydraulic brakes. A tyre lever easily sorts the inadvertant lever pull with the wheel removed. Out of those two bikes though, I'd choose the Java. Cost savings have to happen somewhere - gears trump brakes - and the Shimano Tourney shifting beats the L-Twoo offering for performance and spares.
It is true that for around Bt8000 you are not buying an actual mountain bike. Just something which looks a bit like one. A rigid fork will be more reliable bolted to a practical hybrid frame. If you don't like mail-order, I'd suggest you check out the nearest Decathlon offerings on arrival. Their Riverside doesn't have a crappy 'suspension' fork or cheap disc brakes and is a steal at Bt5000. Comes with 700[29er]x38 tyres. Pick up a Shrader/Presta combo minipump while you're there.