Should i go Boulder 1060 or Jeff Rowland 625

I echo Thesoundhouse's comment: "Until there is away to audition your speakers with both those amps you are only guessing."

It is hard to predict amplifier/speaker synergy - although you can eliminate testing some combinations by way of deduction. Perhaps the following experience may help you in the elimination process.

I have auditioned the 802D in combination with Classe, and separately the 802 Diamond in combination with Corus & Jeff Rowland Model 625.
Both combinations sounded good - but I thought the 802D + Classe had a bit better overall tonal balance whereas the 802 Diamond + 625 combination was a bit bright. I also compared the Model 625 to my Cambridge Audio Azur 840W amplifier. (using Wadia CD player and Corus preamp).
Unsurprising the Model 625 best the 840W in terms of detail, transparency, soundstaging, bass control and extension. However the 840W (which has slight warm bass and soft treble) was a better tonal match for the 802 Diamond. The reason for this is that 802 Diamond is brighter and has tighter (less bloated) bass than the 802D.

So based on my experiences a slightly lean amplifier (with good bass control) will better suit the 802D. But equally a more neutral speaker (802 Diamond?) than the 802D may better suit the Pass Labs.
So my suggestion is try different amp/speaker combinations, but if at all possible in situation where can directly compare the amplifiers or speakers - otherwise you guessing how well it will work.

BTW, I am happy Corus and B&W 803D owner.

After the Dan D"Agostino Momentum monoblock amps, the two Jeff Rowland rooms with his 625 amp were my favorite solid state systems at CES. The sound was incredibly musical, with great depth and height of sound stage. I preferred the sound to the Boulder which is too lean sounding for my taste. Go with the Rowland, won't run hot either like the Pass does.

Rowland is a much better unit. They have great support if you should ever need it as well.

Boulder is a much better unit. They have great support but you will never need it.
That was helpful, I'm sure.

Horses for courses, but I think Boulder is among the most melifluous of SS amps, along with Burmester, darTZeel and the BEL 1001, sadly no longer in production.

But I think the 625 is the best balance for your preamp and speakers. I think it would provide a synergistic animation to your system.

Or you could choose to desiccate your speakers with Ayre MXRs and achieve that "lasers through Vaseline" effect to which so many achieve and to which so few aspire.

I know this doesn't address your question, but - if I were in your shoes - I would be thinking more about new speakers than either the Rowland or Boulder. Both great amps, but they're not cheap. For the same or slightly more money, I'd be wanting to get into potentially *much* better speakers. I'd be thinking Rockport, Tidal, etc. Even Merlin.