Some questions about grafting stone fruit…

I’ve only ever been modestly successful at grafting. I don’t know if it’s my fat fingers, or lack of skill, or what. I’ve done same-size cleft and saddle grafts that took, and a couple variations of whip and side grafts, but only apples have ever taken for me.

I’ve read a few things about stone fruits.

One – they do better with summer budding (something I’ve never been successful with)

Two – they are more finicky in general

So a couple questions:

I’ve found several nurseries that just sell scionwood. DO they only sell DORMANT scionwood, or do some sell summer budwood as well?

If I obtained dormant scions, but kept them moist and cold until the weather is good and warm, say mid May around here, when the rootstock is very actively growing, would I have better success with a whip, cleft, or saddle graft, assuming I can keep the scions alive?

What type of budding works best? T bud, chip?