How much to share?
How many people ?
All your direct ancestors?
Plus their siblings?
Plus their spouses?
Plus the spouses’ parents (particularly useful if your tree has many inter-marriages between families)?
Basic BDMs only?
Plus family notes?
Private/personal information – ONLY if a highly restricted site with good access controls please!
The answer to this determines which tree will suit you best.
Are you aiming to collaborate with others in real time on the one tree?
Are you ‘fishing’ for connections who may have that elusive ancestor you’ve lost?