With Unreal, I've seen a lot of high-class games made with it, but the PC requirements seem to be the hill that makes or breaks it for a lot of people. I've heard of people with larger projects needing a high-class high-end desktop with 32-64GB RAM.
I'd look at how things are running for you on Unity first. If there's computer slowdown, I wouldn't switch to Unreal. If it runs fast, well, maybe think about it - though I've heard the Unreal engine is more demanding in that regard. 🤔