please comments on these bicycles - MTB to buy

I don't know what I've done to deserve that compliment @Oxoman

I wasn't going to reply to @pep.fermi 's post, but seeing as the mtb section isn't too lively these days, I'll give it a go. You never know it may smoke out a few further contributors!

To have one bike for both road and technical trails means that it will not be particularly good at either. It will be a compromise. Get the sort of suspension and geometry that is good at descending rapidly soaking up the bumps on the way and yet be able to climb too will be terrible on the road. That suspension will feel spongy and will soak up your energy. The bars will be too wide for commuting and the gearing too slow to allow you to maintain a decent speed. The bike will feel heavy and the grippy tyres and heavy wheels will slow down your acceleration from a standing start.

A good road bike will require a far better (and younger) rider than me to ride technical trails. The narrow tyres will lack grip and will not damp out any of the trail chatter. The narrow bars will be unable to resist the turning forces from those rocks and roots trying to deflect your front wheel. The steep head angle will make the bike feel unstable when descending. The lack of suspension will shake the fillings in your teeth. The gearing will fail to get you up steep climbs of more than a few bike lengths. If you have any knee problems then they will get worse!

So what's to do? Where is the solution?

The question has already been answered; it's a gravel bike.

https://www.bikeradar.com/advice/buyers-guides/best-gravel-bikes/