Basswood in my experience the longer ya have it, it becomes harder than the Hubs Of Hell. Sugar Pine & White Pine can get almost black with oxidation over a very long period of time, but get past that and it's fantastic to carve with a knife. Heads doweled to the body with cedar arrow shafts have never broken. All my carving is done with hand tools, no Foredom or power tools. I like spiral wood chips, and despise clouds of saw dust. Nasty Stuff!
If there is a Amish sawmill in your area, stop and talk to them. They know where, and who has the White Pine, and you will get yer $$ worth. Bring the wood Inside, and let it sit for at least 6 months then get carvin'. Always keep pieces of wood in aged rotation marked in yer shop, and yer Good to GO.
Have Fun, and shoot ducks over yer own decoys! You will enjoy the Ohio show, lotta good folks and all the supplies ya need, so stock up.