I might would suggest that you go through the myriad archived in the SEARCH feature discussions on "de-farbing" the several M1861's out there as a brief posting may not give you all that you want or need in detail in order to ber able to make an informed decision as an educated consumer of the Best of the Worst.
For a Quick & Dirty perhaps...
Within the realm of the overall poor level of reproductions-
The later Euroarms M1861 is better than the Armi Sport in everything but price. Its overall "dimensions" are closer by degree to the original M1861, on some points very close as its lock will NUG take original or repro-original parts, and with minor work one can use restored original or repro-original parts to replace the cast Italian parts with machined/hardened/tempered ones in some cases.
Both EA and AS M1861's are over sized, blocky, and can weight almost two pounds more than the originals which gives them a wide clunky look and feel. AS more so than EA. Workmanship, fit, finish, and Quality Control vary gun to gun, but overall are about the same EA to AS. Depending upon the stock wood, EA's can run over half a pound heavier, and AS 1.5 to 2.0ish pounds "over weight."
Because of the QC issues, often times AS's can be hard to prime or cap because the half-cock and full-cock notch positions on the tumbler are more or less near worker random and the hammer does not go far enough back on "half-cock" to be able to get a cap on or off.
Pedersoli's basically a Euroarms where they took the same parts but applied better workmanship and less random QC to the making or assembly so one gets a slightly better "built" or better fit and finished version of the same gun.. but add a significantly higher price.
ALL three need at least entry level (so-called) de-farbing or "de-farb" work NUG removing the modern Italian barrel stampings and sometimes refinishing the stock. All three suffer from modern Italian barrel design issues, particularly in the nipple/cone and bolster areas and as a result of design changes the repro's are more prone to misfires and require more attention to stricter cleaner practices, etc.,
And last, since introduced roughly thirty years ago or so, EA and AS have tinkered with their product making changes here and over the decades. For example early EA M1861's had atrocious thin stamped metal butt plates, lock plates, and steel sheet barrel bands that were bent and formed to shape and held closed with a weld.
In general, and IMHO...
Many lads do not know enough or care to know much about the original firearms that are supposed to be using copies of so Hobby wide there is a wide amount of latitude and acceptance on personal and unit levels. As a result, some lads are more than happy to have, and to use, EA, AS, or Pedersoli reproductions right out of the box. So, it can be a varied discussion as to what is good or bad, or right or wrong, and what works for one lad may not work for the next.
In gleichem Schritt und Tritt, Curt Schmidt
Not a real Civil War reenactor, I only portray one on boards and fora.
I do not portray a Civil War soldier, I merely interpret one.