Denafrips Venus 1 vs Venus 2

i would think the dena site will specify the areas of improvement

otherwise a quick email to alvin at vinshine should yield a timely response

I agree with the above post. Please call Alvin at Vinshine Audio. please see link below for contact info:

https://www.vinshineaudio.com

https://www.vinshineaudio.com/contact-us

I think the main differences are (but it's worth checking with Alvin):

Improved temperature controlled crystal oscillator. 
Clock outputs to work with Denafrips Digital-to-Digital converters.
Power supply improvements using higher quality filter caps. 

Earlier this year, I upgraded from a Terminator (first gen version) to a Terminator Plus and added the Gaia DDC. Using the Gaia with an i2s connection to the DAC resulted in a very noticeable improvement. 

Even if you are only looking at the DAC right now, having the ability to add a DDC with synchronized clocks gives you a nice upgrade path for the future.