I don't see much futuristic out there, especially on Youtube. My First, and best building style would be futuristic.
Many People over-embellish it with too much steel, and metallic-looking blocks.
(Was about to put in Spongebob meme, but nah)
While metals are part of it, try mixing in natural stones such as dacite, diorite, and marble. (Polished Variants are nice too)
In the end, use your judgement!
I'd like to say I am good at Sci-Fi. Sci-Fi in my experience can be literally anything surpassing us. If you are going to do Sci-Fi, Try using lots of unique shapes. Hexagons are a favourite of mine.
Also, Experiment with colours, The Covenant get away with blues purples and pink.
Another thing, Do not, Under any circumstances, Use Rupture for Sci-Fi unless there is a very very very good reason for it. Doing so is a great way to get punched in the face by me.