I had a plant that i didnt have room for anymore and wanted to keep. I cut every branch off and the top. All 15 cuts have rooted in about 2 weeks, so i dont think it really matters at all. As long as the conditions are coreect it should be all good.
Truth is, cannabis is a plant that roots/clones very well. Most growers do not have any issues when rooting either tops or shoots if conditions are ideal. But if you want to get technical the shoots have a higher success rate.