Great choices! I have one of each as pets, both hens, and they're wonderful. I picked WH bc of their mellow reputation and Cayuga bc of their reputation for being quite and relatively mellow.
Both, at 3 mos, are very stable and even tempered. The Cayuga is more inquisitive, sassy, and bold than the WH, who is more reserved and mellow in general but also more quick to try to challenge us and be a butt until she realizes she's not gonna win...then she settles right in and is an absolute love. The Cayuga is more demanding and, currently, quite LOUD in her attempts to get her way....whether that be attention, goodies, or general protest bc the WH is getting 1:1 time. Hoping she quiets down a bit..that would be my only complaint about her. Both were excellent choices for pets and I don't think you can go wrong with either, or a mix of the two!