It’s a Hx vs a DB machine. Got to read up on which one you think suits you best. And E61 vs the Elizabeth group head. E61 group head has its pros and cons. For me I got a child at home so the exposed E61 group head is a hazard. And from reviews Elizabeth steaming > Marax. With Marax u also probably will consider to do the mod to reduce water wastage.
Also to consider is playing around with temp, more precise on Liz vs 2 degree range on marax. Both have good thermal stability with the Liz warming up faster. Liz has customisable bloom and steam preinfusion. Marax also doesn’t come with preinfusion but has room for addons, esp if u want to play with flow control which the Liz can’t add on. So have to see what kind of beans u like which can inform if u really need preinfusion or flow control.
Go to coffeeforums uk and there’s quite a number of threads that also ask about Marax vs liz
Btw not sure how reliable it is but I was informed that prices generally may be going up soon due to increase in shipping costs and exchange rates... but might have been a marketing technique

1) Easy choice for me - got Liz because my tabletop depth is only 40cm and Marax won’t fit. So it was my circumstance which determined what I’d get... but if I had to choose between the two, even with big enough tabletop I’d probably go Elizabeth again. If I really want to experiment, play around with flow control I’d probably save longer for Bianca. I just need something that is “quick and easy” to make in the mornings rather than fuss over all the small things... less stressful is what I’m looking for haha.
2) Cowpresso and highlander are both authorised dealers which u can see from lelit’s official website. Highlander doesn’t bring in Liz. Only Victoria, Bianca and Marax. Ace home barista claims they are but I don’t see them listed there. The gluons is a known seller based in Malaysia and do offer it cheaper generally but may be more of a hassle to fix or get help if anything goes wrong.
3) generally with good maintenance they can last for years, with the parts esp on the E61 group head easily replaceable. But u really need to consider putting in the effort to do maintenance, backflushing, etc. Don’t forget the grinder also will need cleaning too!
4) generally SG water is soft enough to be used directly, but unless you really want to get into the specifics of water... it can be a deep dive here... like how some people will remineralize the water, testing the softness, etc etc. I suspect most just do with filtered water eg brita, cleansui.