what is your purpose of a foldie?

speed? tour? or just taman ride?

OK here's my thoughts :

1) Tern C8 - well it's Tern. I have no comment since i have no experience with it but in general, ppl say it's a good brand, specialising in foldies so it is backed by experience. However i have recently read of cases where there are cracks occuring on different part of the frames. again i cant provide an informed comment.

2) XDS K2 - also a common brand, it is most seen among MTB. from the spec it seems impressive, Sora FD RD, hydraulic disc brakes, 20-incher and comparatively lighter than others in the list.

3) Trs Bliss - 24-incher. larger tyre can say allow you to ride faster than smaller wheel foldies, but 24-inch tyres are hard to come by and choices are limited, if you are looking to source them from local shops. not as portable after folding compared to 16- and 20-inchers but if you hardly need to fold then it wouldnt matter.

4) Trinx Flybird - the frame shape reminds me of KHS. 16 speed . if around same price i would go for XDS K2 instead

5) Raleigh Evo - no experience but i have owned a raleigh Ugo with almost similar spec. it seemed touring ready with the rear rack, looks solid but i have to first tell you it is comparatively heavy. good if you're looking to train your legs.  maybe you'll get used to it after a while and wont have issue with the weight.

then keep the gomax and sell the mongoose.

i believe currently foldies are in hot demand and you might even can gain profit compared to your buying price
follow the indicated pressure on tyre side wall. itu driver bukan cyclist apa dia tau. sohai driver.