Of the two men it's been Koura who has been the most impressive. He turned professional in 2014, as a 19 year old, following a 29 fight amateur career that saw him going 19-10 (6). Given his lack of amateur success Koura turned professional with a C class licence and entered the 2015 Rookie of the Year, which he would win with a decision victory over Ryusei Kitamura in the final.
Since winning the Rookie of the Year we've seen Koura go 5-0 (5) with wins over the likes of former world title challenger Jeffrey Galero and the upset minded Jaysever Abcede. He has shown raw power, good boxing and an aggressive mentality that makes for fan friendly bouts. There are flaws with Koura, who can be reckless and open at times, but he has that type of power which is rarely seen at 105lbs. That power of Koura's has caused one or two problems, and although an OPBF champion, and Rookie of the Year winner, he has only had 35 combined career rounds and has never been beyond round 5. That may well be hiding issues with stamina or pacing, though at the moment it's not yet been a problem.
The challenger turned professional in early 2016, passing his B grade test on the same day as current IBF world champion and fellow Watanabe gym fighter Hiroto Kyoguchi. He took that exam following a notable amateur career in which he went 55-19 (16) and had captained his University team whilst fighting at a consistently high level. In the professional ranks he took 4 quick blow out victories before battling hard to over-come the talented Dexter Alimento with a split decision. In 2017 we've seen him come up just short against Reiya Konishi, in a bout for the Japanese title, and follow that loss up with two blow out wins.
In the ring Taniguchi is a technical but aggressive fighter. His power is probably not as good as his record suggests, but is still very good, with issues regarding potential stamina problems also possible. Taniguchi has done 10 rounds once, in his loss and perhaps needs a little bit more seasoning before a potential world title fight, if he over-comes Koura. The problem with the youngster is that too many of his bouts have come against hapless foes's and he already has 4 opening round stoppages, and has scored no wins over fellow Japanese fighters. That's not to say he can't, but he really should have faced some domestic opponents rather than so many limited Thai's and Filipino's.
Although both men are aggressive, heavy handed, flawed and both are 23, there is a lot of differences. Taniguchi is the more well schooled from an amateur perspective and is a southpaw, whilst Koura is arguably the more impressive with his wins over Galero and Abcede over shadowing Taniguchi's wins, and Koura is also the man with the confidence of being a champion.
It's a 50-50 type of fight, and at the time of writing that is a view shared by a members poll on boxmob who have Taniguchi narrowly ahead 51-49. We do favour Koura, but it's likely to be either a very close decision, or a bout decided on a single moment of genius. We feel that Koura's power makes him the more likely to do something magical, but really there is very little to split the guys here.