Out of the 3 Characters my vote goes to Gingka. While I may be slightly biased towards any Zero stuff because I have not seen all of Zero-G what I have seen has not led me to favor Zero very much.
Lets all remember the title of the thread is who is the best blader among them not who is the best character but by all means I believe the character stuff is fundamental to deciding which is better to an extent and I believe it would be on topic used in reasoning of course but I'm going to explain why I think Gingka is the best blader.
I like how Gingka starts out Elite like but I notice some changes throughout the series to how strong he is.
At first he is the Hotshot everyone wants to beat and he deserves the title with his amount of points he had at the time.
At this time the Dark Nebula barely considered Gingka a threat to Ryuga at all and brought in Kyoya to beat him in case of anything. I found at these points Gingka was considered a good blader somewhat not ridiculously famous yet but well known I would compare this point to other at the time strong bladers like Ryutaro and Others similar. I feel his power shifts after he is beaten by Yuu in that 3 or/and 4 person battle in the Finals of the survival tournament, suffering his Second loss I believe (Not counting that 2 out of 3 Crab stupidity with Tetsuya) It shows he wasn't the best of everyone. I feel there is another power shift during 10000 Beypoint tournament with him beating Ryutaro and having his renewed connection with Pegasus, then Placing 3rd with Tsubasa and Yuu showing he wasn't the best always. Then he gets creamed by Pheonix aka his Dad another person he loses to that upsurps his power. I realize I've just started rambling about Gingka's history but the point was to show he did improve but generally lose to very strong people and defeated them in the end.
As for Tyson, I like how strong he becomes but from what I remember of the orginal is him losing often then rematching to lots of people like Carlos who really wasn't a strong blader.
I think he gets by far stronger in the end by V-force and G-Revolution but I have trouble overlooking his early stage compaired to gingka, there are moments when Gingka wasn't so great either like his childhood but he was decent then but so was tyson I guess.
I feel Gingka beat more powerful people in comparison to Tyson and that is why I think he is the strongest.
I would like to say about the world tournaments and stuff I don't think that can really compair because we don't know that the WBBA held one each year in Metal Fight as the WBBA had to be remade somewhat after the first season.
In full honesty I think other people in the show are stronger than both these 2 XD because these 2 characters beys are too special as Legendary Bitbeast and Original Star Fragment or something.
1st Place Beyblade Colosseum 1 2013
1st Place Five Fists Beyday (Maryland Beyday 2012)
25 Tournaments Attended: 9 Placed In
Tournament List
Total 25 Tournaments, 2 HMS, 2 Plastics, 14 BB-10 MFB 7 Zero-G MFB 1 Limited
3/19/11 Spring Cherry Blossom ARISE
5/14/11 Blademore
5/29/11 Beydays come on
6/12/11 Fill my eyes double beyblade tournament
8/12/11 Summer Spin Showdown
9/18/11 Better Than School
10/16/11 The Dual Duel
11/19/11 Novembrr-Brawl
2/25/12 Leap Year Lashing
3/25/12 Cherry Blossom Combat 3rd Place
4/29/12 Spring Sortie 1st Place
5/26/12 Five Fist BeyDay 1st Place
7/22/12 The Triple Threat
8/12/12 The Lazy Hazy Swayz Beys of Summer
9/23/12 Autumn Assault 3rd Place
10/21/12 October Achtung 4th Place
11/17/12 Thrills, Spills, and Chills! 1st Place
2/2/13 Beyblade Colossuem 1st Place
3/24/13 Merry 2nd Anniversary 1st Place
4/21/13 Beyblade Revolution Qualifier
7/14/13 Heated Metal Plastic-y Madness!
1/19/14 Happy Gnu Year! 1st Place
3/30/14 GBT2: Maryland Qualifier