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For me - especially with the new 1.0 client - Waves is way ahead of BTS regarding usability, stability and speed. I also find it more intuitive for newbies - lesser technical lingo means more users get attracted. Also the coin is going very well for me - see a realistic goal of 100-120US$ for Waves, which would place them into the top 10 of coins regarding market cap. So yes, I´m Team Waves ;)
(and I will of course also keep an eye on BTS when it gets more stable and practical for day to day trading)

I use both and I wonder how exactly I'm supposed to find this liquidity thing on Waves

I don't see any big problems with Waves interface. It just lacks features as a DEX. But it's technologically better than ETH IMHO. Waves and BTS are not really competitors.

Edit: The real competitor for Waves is Komodo which has got Decentralized ICOs, atomic swaps before anyone else, zk-SARKs........And it's always absolutely more secure than Bitcoin. https://steemit.com/cryptocurrency/@vimukthi/the-case-for-pow-as-a-service-komodo-dash-and-mining-algorithms-discussion

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