I believe Mediamarkt offers the best selection - I use the one in Elche, nearer Quesada and less hassle.
Most TV's now have some smart functionality - though most of it you don't need. It's more important to have a reliable TV with a good picture.
We have found just from feedback from clients over the years, that the 'own brand' type TV's - IE Carrefour's Bluesens or Bluesky, cheap brands like Oki (should have stuck to printers), seem to have a shorter shelf life - IE break 5 mins after warranty. The bigger players seem more reliable & Samsung do make their own panels.
Samsung make the most popular TV's - we have an office full of them, reliable. Tizen OS is fine for most standard apps, Netflix, Youtube, even seen/tested a few IPTV apps.
LG - used to be lucky goldstar & changed slightly to make sound 'more premium' - they do make decent TV's nowdays, also as above - for standard type apps, work well enough.
Most TV's unless they come with their own sound bars - usually need something to improve the audio as generally poor on most flat screen TV's.
Sony do an Android TV - but I can't see the point, as you can get an android box/stick or the amazon stick (which is an average android stick when you've cracked - not that great) - basically, unless you want to use the headache that is Kodi for free stuff, you really don't have much need for android on your TV & if you do, it may be better to buy the TV on picture quality, size, price etc - as you can add Android into any TV, quite easily if you want - though I would suggest today, we don't need to - as can get Spanish, English, IPTV services certainly on the new Samsung & LG's as seen both their app stores, which are the best of the smart TV offerings.
You are likely also to find that ultimately a set-top box, designed to do a specific TV service, will do it better than most apps anyway, so you don't really need to drive yourself too mad with the 'smart TV' thing- as all 90% of people use it for is 'Youtube & Netflix'.
You can web browse on your TV, but try it with a TV's remote control & it's more trouble than it' worth often, unless you start using a plug in keyboard etc.
Paul
http://www.televisiontechnology.eu865774055