I generally steer away from any discussion of past vs present fantasy match up, all time rankings, lbs for lbs debates etc for a number of reasons.
My boxing knowledge only goes back so far. I'm in my early-mid 30s so I remember watching Eubank-Benn, Bruno and Naz as a kid in the 90s, and was aware of the likes of Tyson, Holyfied and Lewis having fights in the states. They were out of reach on Sky ppv, something I never had back then. And it wasn't until I got into uni when I began to actually take a proper interest in things around 2005.

I'm aware of some of the history, the big players from decades past, but actually watching of old classic fights is limited. So there's only so much I could argue a case in these fantasy matches.

One of the big ones in recent years was the belief of many that the Klitschkos were only dominating a very piss poor division and that they wouldn't have stood up to the previous more golden years. My estimation was that they were infact a whole new animal and would have competed wth and maybe even beaten the greats of the past who were pretty small for the division in modern terms.

There has to be some truths to both sides of the arguements though.

Fighters of yesteryear would have many more fights than todays top tier guys, they would fight more dangerous opponents due to more limited number of titles and so less cherry picking.

But todays athletes are ultimately more enhanced in their training, and we have more knowledge these days in science than back then. Advancements in techinques, strategies and game plans etc.
There's a very good arguement for pretty much all sports that the standards of the modern day is better than decades gone by.