I have no experience with the drybase. I dove arctic for a year and I recently picked up a set of xerotherm. My experiences might also be colored by the fact that I dive a CF200 and not a thin trilaminate suit.
In the summer I was diving a pair of military thermals (patagonia capilene 3 top and bottom) and arctic socks. I picked them up for $33 a piece ($66 total) online. The capilene was great when the water was in the high 60's and 70's above the thermocline or the St. Lawrence. When I was diving deeper than 30ft or in places with multiple thermoclines (water in the low to mid 50s), I would mostly dive the arctic. I might mix and match, dive the capilene for one dive if I wasn't going to be at depth too long. While the cold was bearable for these dives, they were within NDLs and it was noticeably "cooler".
I don't know if what kind of suit you dive or if your body runs hot or cold, but if you are looking to save some money than take a look at the patagonia and see if it suits your needs. If money isn't an issue, I would look at the xerotherm. Good wicking layer, better thermal protection/wider temp range. I'll probably make the xerotherms my standard light undergarments, but I haven't had a chance to dive them in warm water.
On a personal note, I never really understood how someone could overheat in their suit until I did a dive in my arctic undergarments where the majority of time was spent above the thermocline in water ~72 degrees. I was so warm I was ready to say f**k it and flood the suit.