Well that's like asking whether you like Darth Vader or Anakin Skywalker.
I'd go with Taka though, if only because I like using characters who we don't know as much about in fan fictions and stuff because there is more room to tell stories and stuff I guess.
Which is also going to tie in with my answer; some would say they like Scar because we don't know as much about Taka which as been bought up in the thread already but that's the reason I chose Taka over Scar, I happen to like the fact we don't know as much about him.
Scar was just a villain through and through, he'd betray his family just to get away with something. Taka is like giving him an actual character, it's neat. However I hate it when people call Scar Taka unless literally referring to his cub days.