Well, I LOVE tiels...and we also have a conure (Franklin)...but we also have 2 tiels and the last tiel we bought the end of march, our "Chicken Little" he was take a chunk out of your finger and leave you bleeding wild. We've had him 4 months and he's the nicest guy! Within 3 days, he'd sit on our finger and within 4 weeks he didn't have to be toweled in or out of his cage.
Within 3 weeks of getting him he started talking and he's absolutely the best bird to take out of the cage...he sees me open the door and he hops right down and onto my finger. Our conure always gives me a "testing" grab...but Chicken just hops on my finger. And CUUUTTEE! Oh he's so darling!
And when I say talking...he's saying "Pretty pretty pretty pretty birdieee/bird" He say's his name... "Chicken Little...Him a good boy?" He says "Hello, What'cha Doin?" and he's learning more and more all the time. I put a couple short video clips on youtube...just search Nakiska71 to find them
He LOVES to ride on my shoulder everywhere, loves his "tiel walkabout" time for treats and snacks. He loves to watch youtube videos of other cockatiels talking and playing...He's just an awesome bird.
There's pictures of him in my profile albums. Just click on my name.
I have great things to say about both species..tiels and conures. I'd say if the tiel is young, I'd consider it...do you know if it's male or female? Females are very very very quiet birds and I've never seen or heard one learn to talk...but both male tiel's I've owned have both had very extensive vocabularies.
Conures...although they do learn to talk...are often harder to understand, they have very gruff, rough, gravelly voices.
The downside to tiels are that they are a powder down bird and are rather dusty...where conures aren't...but that doesn't make conures cleaner...mine is a definite pig! LOL
The choice is yours...but if it were me...I'd consider the tiel. They do make nice pets. However, if your heart is so definitely set on a conure...then you may want to hold out for one...because if you regret getting the tiel after the fact, you could hold a grudge against it which would ultimately affect your relationship.
Good luck,
Toni