When I started doing genealogy, I kept my tree on my own computer, usng the Legacy program, recommended by a second cousin. She also let me use her login to Ancestry. But I, and all my ancestors, are British, so I found Find My Past much better as a source for British records. I never created trees on either of those sites.
Then I found my great grandfather ( Pilcher-98 ) on Wikitree, explored it a bit, joined, added my great grandfater (Sept 2012), and eventually transferred all my personal tree to Wikitree.
Find My Past is great for British records, but not as good for US, Canadian, Australian and New Zealand, and no good at all for South Africa (where some of my relatives migrated). I know Ancestry is better for US sources, and I have sometimes found things on My Heritage that I couldn't find on FInd My Past. But Find My Past is the only one I pay for.