It doesn’t matter if your favorite Doctor was 9 or 11. All of the regenerations have broken your heart, yes? Admit it, 10’s was the worst of them all. Nine and Eleven had a companion present, and they gave a loving, heartbreaking speech. Ten didn’t have anyone at all. He was alone in the TARDIS when his time came. Yes, he visited them all before he regenerated, but nobody was there when it happened. I don’t think anyone was aware that he was even regenerating. Ten loved all his companions so much, yet he was unable to say much to them. Donna could have been present, if it weren’t for her erased memory. Rose was in an entirely different universe, and she didn’t know the Doctor at the time he visited her. He gave Martha and Mickey and Sarah Jane’s son (I don’t quite remember his name) a quick save before leaving. But at his regeneration, he didn’t have anybody with him. While Nine could give Rose a “fantastic” speech and Eleven could explain to Clara how he must change and see Amy’s face again, Ten was alone, and all he could say was that he didn’t want to go. If this doesn’t affect you so much, I don’t know what does.