I’ve found IceBreaker merino pretty comfortable, but it has to be the lightest weight version. The thicker ones seem to retain too much moisture.
A quick comparison I did about four years back to compare a HH, IceBreaker merino, and Byrnje base layers is easy to replicate. I weighed them, then soaked them in a basin, put them on a hanger for 10 minutes and weighed them again.
The least water retention was the Byrnje string vest type (by a big margin over the other two), followed by the HH, and then the IceBreaker.
I tend to wear the IceBreakers purely because it’s more comfortable as a T-shirt. The Byrnje has been banned by my wife for some reason, so it only gets worn when conditions are likely to be extreme (and it’s really good then).
I was going to replace the IceBreakers with HH when they wore out, but that hasn’t happened yet despite being all year round wear.