which coin is better for an asset waves, ethereum , wings or bitcoin?
I would be in favor of BTC and ETH as currently they are proven to be reliable, though with regard to market changes the BTC and ETH values change as well.
For more detailed analysis, the site
https://bitcoinaverage.com/en/comparisons could be used for reference.
You are treating digital coin is like an asset then bitcoin is the good asset for you to make a good profit. ETH is still growing, but BItcoin is already grown up and still becoming strong in the digital market. So my choice is Bitcoin. For the low investment, you can go for waves and decent investment ETH is good.