I'm interested in why you didn't go with the XPS?
I've got an older Macbook Pro and this was on my list as a possible due to pricing.
I also use an XPS at work and found it OK.
If it's my own money though, worth considering all opinions!
various reasons, some objective and some completely subjective and some of which I could have perhaps avoided with a bit more due diligence
I think the XPS is a nice laptop and was fairly happy when I played around with one in purple shirt world, I've always had dell business laptops at work in the past and they've generally been rock solid. I don't really like windows 10 much and so figured I could dual boot with linux and use that for most things.
I'm not a person who tinkers much with computers any more and last time I ran a dual boot set up was with a desktop I'd built myself a few years ago. This time though was more of a faff - both being unfamiliar with Windows 10 and the added faff with secure boot etc.. Probably quite trivial if you're used to doing this but lots of wasted time for me... was quite frustrated. Got linux installed and gimp (the photo program) is absolutely FUBAR'd on a HiDPI screen. It was just very apparent that this wasn't going to be fun and that for the amount of money being spent I really ought to just hand over a few hundred more to avoid extra future hassle too. Mac on the other hand has had retina displays for a while and all programs work perfectly on them.
I'd still need to use windows for things like itunes for my phone simply doesn't work on linux, the touchpad though better than average is still crap in comparison to a mac(as are the pads on pretty much all windows laptops) - I like to work on the train and not have to take a bluetooth mouse around with me too.
The screen is technically a higher resolution on the dell but is a bit squashed and actually the colours on the mac are better, which is perhaps more important when it comes to my photography hobby. (I can also transfer photoshop and lightroom across from my old mac). I had pretty much max specs on both (albeit 512GB SSD on the Mac) The CPUs are similar despite the mac being a previous gen, same amount of RAM (16GB) but it is faster on the mac, the SSD on the mac is better, the Iris graphics are better on the mac.
The overall construction of the mac seems to be better - the case is nicer, the touchpad is awesome. It weighs a bit more about a dell but I'm not carrying this thing around in a handbag and I don't really care about the difference of a couple of hundred grams or whatever in my backpack. General day to day work tends to be less resource hungry in OSX, leading to better battery life and better all round performance with comparable specs. I can carry on using textmate for coding, I've also got a unix terminal. I also don't have to have more faff installing matlab in linux (not sure how much of a faff this would be but I didn't bother as I'd already decided I'd made a mistake). I use an iphone, itunes works as it should on a mac, my phone syncs nicely with the laptop, my calendar is shared as are bookmarks, notes etc.. The touchbar is cool, though a bit gimmicky at the moment... handy to skip through video clips, open bookmarks quickly etc..
Basically it was lots of things, not any one particular thing. The mac is a nicer all round laptop, frankly no one else comes close as far as laptops are concerned. I think the Dell XPS would be fine if it was mostly plugged into a docking station on a desk (with a mouse!) and occasionally needed for travel, using excel etc.. I was aware of some of the downsides and decided to take a punt as I could compromise a bit for the saving of a few hundred pounds but then when further faffing and issues occurred it just wasn't worth my time. Given that either of these is a fairly serious purchase I decided that if I wasn't really happy and having doubts about the whole thing then I should just pay up and get the better product.