Beach felt that to lift the SWALEC Cup for the second season in a row crowned a perfect season for him with both club and country.
He said: "Winning the SWALEC Cup tops off a great year for me on a personal level. To win the World Cup with the sevens and now this, I didn't believe it would get much better but it has!"
Beach believes he and his Neath team-mates countered the threat posed by the youthful Llanelli, and the 28-21 victory proved they knew what they needed to do to win.
"We knew what Llanelli would bring and I think this showed in the lineout and our defence," Beach added. "At half time we stuck to our game plan, and it worked well for us to lift the cup.
"We took our foot off the peddle early in the second half, but we played with commitment for the full match and regained control to win the cup."
Neath head coach Rowland Phillips agreed with Beach's assessment, and felt it was a credit to his team that they could stand firm against an exciting Llanelli team. Phillips said: "Llanelli have been playing very well throughout the season, and have played a lot of really positive attacking rugby.
"But we were strong as a team, played some good stuff as well and I felt we deserved the victory."
Neath's kicking hero Arwel Thomas said: "It was a cracking game, a good advert for the Welsh Premiership."