My herbie concoction making friends use Mountain Rose pretty much exclusively. I've used them both successfully.
Richters sends me a print catalog every year so, of course, I tend to select items from them - I can see and read about potential selections. Being able to sit with a cup of tea and a pencil makes it much more likely that I'll find things and then go to the website to get others.
In addition to seed packets, Mountain Rose has bulk herbs, teas, aromatherapy supplies, butters, oils, salts, extracts and syrups, facial care, body care and bath, containers for your concoctions, books, kitchen stuff and pet supplies.
For those of us who grow sprouts in the winter, they also have a few sprouting seeds.
One item that caught my eye is "Tasty Tea Collection". It's seven seed packets: thyme, tulsi, valerian, vitex, white sage, wood betony, wormwood, yarrow and yerba mansa.
Richters sells seeds, plant plug packs and trays, plants and supplies. They specialize in herb seeds, oils, kitchen gadgets, garden helpers, dried herbs, teas.
For example, here's the entry for Anise-Hyssop (I can smell it now and see the pollinators all over it).
Everything you need to know to decide, right there on the website page.