I have heard the Spendor and the Tannoys, to me the Spendors are very easy to listen to, but perhaps a bit polite, the Tannoys are more engaging with better dynamics, plus you can tweak the treble energy to your liking. Plus with the Tannoys being 3db more efficient makes them easier to drive with single ended valve amps.
If you read the reviews my impressions are pretty much supported by the reviewers.