I'm happy to take your word for it, but my point is I've never seen Tumblr do anything "different" you know. More or less just a blog platform with a repost function. Admittedly that could be useful if someone pushed it to Twitter lengths (ie, setting trends amongst interested people - better marketing, I'm sure you'll agree), but really it seems to me that most people use it to dump random stuff on to. More so than most platforms (not pinterest mind you.. that thing is made for dumping stuff on haha).
I orginally asked technology or personal preference, because the way I see it he could achieve an awful lot of the same things which ever medium Robert choose. Blogger is perhaps slightly less customisable than say word press for example, but then again that's nothing to go by (if you have the skills you can compete easily). I'm perfectly happy with it for my purposes... again that's nothing to go by. Hmmm. To be honest, I've seen plenty of awesome things done with most blog platforms. It just a question of spending time on it and getting things right. No reason you can't make a really visual, creative blog off-tumblr. So yeah, the more effort you put into design where ever really the more you'll get out of it See what I'm saying?