Merida ride carbon 93 or a Giant Defy 0???

Well still not decided which first road bike to buy! I have been at this now for about a month and my brain is saturated with all things bike but still find myself unable to make a bloody decision. The Merida looks nicer to me and is carbon but “only” has Tiagra whereas the Giant has Ultegra and is ally. These two bikes are heavily discounted from a mail order orientated store. Or do I follow my head instead of heart and buy a 2015 Giant Defy 1 with 22 speed 105 from my LBS? The bikes are all around the same price…….. Aaaaaaaargh please help!!!!!!!!!! 8}