I split my time between Tinos and Andros with Tinos far better.
Tinos in fact is one of my top 3 favorite Greek Islands and has some of the most beautiful villages I've seen in Greece.
Nice beaches, archeological/historic sites, welcoming locals and one of the most unique landscapes near the village of Volax with hillsides dotted with huge boulders cascading down the hills.
Spectacular mountain road on the west side of the interior of the island and just a wonderful and very Greek Island.
If there is any way you can rent a car do so because bus service is limited (at least in October) and you want to go to parts of the island that are truly unique and out of the way.
Check out my photos of Tinos. It's best to open the first photo to get a better view and captions and continue clicking the right "arrow" for the next photo