Jeff Rowlands Amp and Dac vs. VAC amp and DAC


Hello, I am new to this forum but I have a question. I am trying to pair an amp + DAC with my Wilson Sabrinas. I have listened to Jeff Rowlands integrated with the Aeris DAC. And the VAC Sigma integrated with the Aeris DAC. Price is a factor and so is space. Does the 625 need a pre-amp? Any suggestions or thoughts? 
rinpoche
I have all Jeff Rowland components(625 S2, Corus preamp, Aeris DAC) driving Monitor Audio PL500s. Despite what anyone says, there aren’t any absolutes in Audio; let your own ears decide.

I had the Continuum S2 integrated amp and now the 625 S2. I submit the 625 S2 is a decent step-up from the Continuum S2 that should be easily heard, but relatively expensive. You can use the Aeris DAC to drive the 625 or use a preamp.