Best versions? I gotta go Bert Cooper to grind him down. Biggs would avoid danger for a few round but I think his 2nd rate Ali impersonation would fatigue him. He eventually will come off his toes and allow Cooper chances. Bert's power would break through at some point. Maybe around 9 or 10.
Biggs stops Cooper late, see Carl Williams vs Bert Cooper for a similar comparison on how this fight would go.
There's two version of Tyrell Biggs. The one who chose to box and move in his earlier days and the one who chose to sit and trade punches with his opponents for the sake of entertaintment later in his career. Version 1 Tyrell Biggs would outbox Bert Cooper in an exciting fight becuz of Cooper's insane pressure and punching power would trouble Tyrell early. While Version 2... I'm not sure about that, Tyrell is a very durable fighter. Somehow I can't see him getting knocked out. Maybe his chances in winning a brawl with Cooper 65:35 favoring Cooper
Biggs via wide UD or Late Stoppage. Biggs was a skilled & talented boxer who could get down & dirty when necessary. He on really succumbed to the Big HW's & elite fighters like Tyson. Even when he was past his prime & probably on, or recovering from a drug addiction - he had a Prime Bowe on bambi legs in the 3rd Round - further proving his underrated power, as Bowe was known for having a good chin. Cooper has a puncher's chance & can hurt Biggs during the fight but Biggs had a good chin & you needed to beat him continually to get him out of there, and if Prime Tyson & Bowe couldn't blast him away early - then neither would Cooper who isn't anywhere close to their level.
I'm leaning towards Biggs, if he's fully motivated. He was far superior in terms of boxing ability. Cooper kind of needed something to hit back at, to be effective.
If Biggs is properly motivated and in shape, he beats the best of Cooper. Cooper was a very poor man's version of Tyson whom he tried to imitate. Biggs would be able to dictate the pace behind his underrated jab. Biggs should be able to win this fight if he fights smartly. He was a much better talent than Cooper was. Biggs by UD.