To give just one example. If you want to dynamically import components, in react you just use a dynamic import, since it's just like importing any other js function. Compare this to the angular way and draw your own conclusions: https://angular.io/guide/dynamic-component-loader . Granted, angular may have things that are easier to achieve than react as well. And I don't like the looks of jsx and so on. But my generic experience was that angular was always working against me. It reminded me of my java EE days.
Would you suggest I go with Angular or React?
It's a fairly complex project, involving user based label designs, data manipulation, etc.
I am API based server and a heavyweight front-end.
Never used it myself, but the guys from Flipboard made this react canvas renderer which might be useful for you: https://github.com/Flipboard/react-canvas
Now, if angular would prove substantially better in terms of performance or maintainability or so, that might've been ok. But they're not. Performance is on par, I find refactorings actually harder because of the heaps of boilerplate angular requires, etc. They invented way too complex solutions to solve problems that either don't exist, or other frameworks solved better.