Audio Research versus McIntosh tube amps: anyone experience or compare both?

As stated in the title of this thread, considering both brands.  I'm looking for a new or near new tube amp to run my Joseph Audio Pulsar's.  Have been using a Pass XA25, which sounds a little lean with this speaker.  Looking for a touch of tube warmth and bloom, but still good detail.

Considering a new McIntosh 275 MkVI or possibly a preowned ARC Reference 75SE.  New ARC costs more than I want to spend ($6K range or less).  Preamp is ARC Ref 2 MKII BTW.

Would appreciate any insight for those who have experienced both.  Thanks!