Pass INT-25 better than Wilsenton R8?

@travisg If it is a brand new INT-25, and you do not have 200hrs on it yet, give it time and see if anything changes. I know this is the case with the amps up to ~300hrs.  I'm not as familiar what occurs on integrated units, others may chime in here to validate burn-in / break-in for you. Transformers, caps, and more, let it play.    

@travisg, As suggested above, your Pass INT-25 integrated amplifier needs ADDITIONAL break-in time before you can judge its sound quality.  I suggest you contact your retailer, or PASS LABS, to find out the number of hours required for break-in.  

Both amps have different sonic profiles. I am not surprised enjoyed the tube presentation more than solid state even though it is a renowned brand. If the pass is not broken in then you may wish to reconsider.

Yes, make sure you have at least two or three hundred hours on it before deciding.

Also, yes, tube and solid state will have different character. Over the last 50 years I have slowly moved to all tube equipment. If you are not thrilled by the time your unit is broken in I would look at a Audion Research Vsi75. Spectacular sounding unit… detailed but beautiful midrange bloom and bass. 
 

I have owned high end Pass for nearly 40 years… including a preamp. while I love his excellent equipment I found the preamps a bit too sterile. 

As others suggested, give the amp minimum 300+ hours before you decide. I'm saying this from direct experience with the INT-25 which I still own and I think this is the best amp money can buy under 10k. I was also "meh" at the beginning and was not sure if I did make side or forward move (previously have owned Pathos Classic MK3). But after approx. month and a half the amp opened up like crazy. The transparency, instrument separation, soundstage all of this improved. You have a great amp in your hands, don't loose it :)