Hi, I still haven't bought it as it is out of stock on all the sites that ship to where I live (virus sucks) but regarding your question, the Dell G5 SE has the better raw price to performance, while the Zephyrus G14 has better build quality. Both are really good for value but with the Zephyrus G14 one pays for the form factor more while with the Dell G5 15 SE one pays for the price to performance more.
TL;DR the Dell is much bulkier and feels much cheaper but has better price to performance, depends on what you care about.
EDIT: Even before buying I am absolutely sure this thing will handle Resolve 16 perfectly well.
EDIT 2:
The TUF A 15 is also a nice option that's kinda similar in form and price to the Dell G5 15 SE, but if you're gonna choose that you might as well choose the Dell G5 for the pricr to performance.