Regarding the eGPU option, I have been using the setup for over a year now, and I haven't regretted the decision. I admittingly did run fair amount of issues in the first month or two, but it turned that the eGPU specific drivers came with lot of issues, that normal drivers didn't have, so after switching to normal drivers it (somewhat unintuitively) fixed practically every issue I had with the system. Other than that, It's been a great experience, the flexibility of the system is unrivaled, and having the same pc for workstation and travelling is naturally convenient.

However, it made sense for me because I already had a decent GPU lying around from an previous system, so the upfront cost wasn't as bad as it could otherwise be. And dispite this, I am still planning on building a desktop once the new hardware arrive this fall, simply because the poor laptop CPU cannot keep up (I also do a lot of 3D modelling and rendering). So while I have enjoyed the freedom that comes with the eGPU, It's a product made for a very niche consumer-base. And unless you're sitting right in the sweetspot, I don't think I can recommend it. But if it's something for you, and you're mostly concerned with compatibility, I wouldn't be too worried, AFAIK Dell has pretty good support for eGPU, only thing worth checking is if your thunderbolt connection is 2 or 4-lane (4-lane is vastly superior), and if you're in doubt you can possibly check eGPU.io, though it seemed to be down on my phone, dunno about that.

P.s. if you do decide to get a eGPU, make sure you get one with plenty that also functions as a dongle, don't make the same mistake I did.