The Swans’ 1-1 home draw with Everton on Saturday took them to the 47-point mark achieved by Brendan Rodgers’ side in the club’s inaugural Premier League three seasons ago.
“I think anyone that watches us regularly will say this is the best team and squad we’ve had, certainly since I’ve been here,” said central defender Williams.
“The quality throughout the squad is good because the gaffer has done a good job in January and the summer to bring in players.
“The all-round quality and the way we work in training, the shape we work on, is better.
“We can play different formations and we’ve got very intelligent players in the team.
“The main thing is the structure of the staff set-up and the players.”
Swansea have spent all season in the top half of the table and Williams has revealed there is a determination not to let the campaign fizzle out as they look to maintain their current eighth position and improve on their best Premier League finish of ninth two seasons ago.
“We’re safe so that isn’t a worry or a concern and we’ve got different challenges now,” Williams said.
“We don’t want to finish with a whimper, like we have done in other seasons, we want to finish strongly and beat our targets.
“Finishing eighth would be a really good season for Swansea.”