Every time I think I've decided which software I'm going to move to between D5 and Twinmotion, I then see a video like this that makes me reconsider. The three main considerations for me are 1- Speed of processing, 2- Ease of use, and 3- Vegetation asset variety.
That is absolutely the situation I find myself in too. D5 is faster, more accurate in its Preview to Final Render outout, and has tons of vegetation, with more on the way. Its also very lightweight and responsive. But I love the new Twinmotion too. Honestly, both are worth the price, and bought together, are still cheaper than other software out there.