The 17" Titan GT77 is actually very light-weight for its class, just 3,3 KG. This type of laptops used to weight way above 4-5KG. Even now the new Alienware M18 is almost 4KG.
The same can't be said for the 330W which is not just heavy but also very big and ugly. I think the only reasonable 330W charger is from Razer, and on my travels, I use 240W GAN charger from SlimQ which is 1/3 the size and weight. It still fits only into very few bags :- ) I have plenty of big outdoor backpacks but it still fits only into one from Razer because it's so deep.
Dell Precision is 3KG as well but it's full metal chassis with much higher built quality, but no vapour chamber and no capability to cool HX Intels well.
Sadly that's pretty much it for 128GB capable laptops. Of them, the Precision is using super expensive CAMM module which I believe put it out of reach of creatives. I asked Intel to spec it like that for me but I wouldn't pay 2000 Euro for 128GB memory myself...
The Titan is using 4-Dimm slots making it 3 times cheaper. I always suggest to buy lowest config and buy aftermarket memory and SSDs. You can save 1000-2000 Euro very easily this way.
128GB come with another big limit not just for laptops but for mainstream DDR5 platforms. Both Intel 13th-gen and new Ryzen struggle to run fast memory in this configuration because 4x32GB reaches 8-ranks and that puts too much stress on the memory controller. So the fastest memory will be DDR5 limited to 4000 +/- MT/s. It doesn't affect rendering speed in my experience at all though, just mentioning it. 64GB can be run at 6000 MT/s even on laptop.
I think 64GB is enough if the laptop isn't your only workstation. I ran the Titan with 64GB and it was just fine for me with the Corona texture off-load. I just don't multi-task with so many other softwares like Photoshop at same time in such config.
That opens the doors to much more affordable Asus STRIX range laptops for example or the new Alienware or even Clevo/Eluktronics chassis. Because paying 5000+ Euro for gaming laptops is sort of absurd (the Dell was more than 8000... but that is corporate level and the CAMM has big premium on price sadly right now) esp. given these are still plastic boxes with not amazing built quality and questionable longevity.
I am also somewhat nomad with 4-5 months of travelling per year and I travel with 3 laptops, 1-2 27" Monitors and I fit all the into Land Cruiser with child and big husky dog :- ).