if u have 10BTC .... buy ARDOR or NXT ?
Hard to say.
Ardor will go to testnet this Q1 and Solves scalability and blockchain bloat issues that all other blockchains suffer from.
That can make the price go up.
As Ardor is not live on mainnet new projects like Janus, Adel, Debune, BNP Paribas (testing) all happen on Nxt. Also Nxt is running smooth for 3 years and Ardor isnt even live yet and has to set a trackrecord first for being solid and secure, so businesses tend to go for secure feeling first if you ask me.
In Q3 (to be set date) you will get free IGNIS tokens, which is the 1st Child Chain of ardor platform for your NXT holdings and still keep your NXT so that should make the price of NXT go up i think.
In Q3 Ardor will go live on mainnet so that will make its price go up.
I am not trader so it is hard for me to say.
I am 1/3 in NXT and 2/3 in Ardor, but that is mostly because i did bad trading. Wish i was 50/50.
But dont take my advice.
I just want to say that both projects are really good and i think this year is going to be great. Also looking at the energy efficient Proof of Stake algorithm these platforms have.