Ex-Knick Williams: I made ‘right decision’ leaving N.Y.

Derrick Williams knows his decision in late June to opt out of the final year of his Knicks’ contract, worth $4.5 million, doesn’t look great now.

After signing a modest one-year Heat pact equivalent to his prior Knicks’ deal, Williams has played in just 11-of-20 games for the struggling Heat (7-13), who host the Knicks on Tuesday . But just wait, Williams says. The high-flying forward came to Miami for a reason — to improve his defense. And Williams says he has “by far’’ the best coach he’s ever had to teach him in Erik Spoelstra.

Nevertheless, Williams figured the Knicks would want him back when he became a free agent July 1. But he said he never heard from Phil Jackson and never got a single phone call from Knicks coach Jeff Hornacek after he was hired in May.

“For sure it was a tough decision,’’ Williams told The Post. “I love my time in New York. Being one of the fan favorites, leaving a place where I felt I could keep getting better, keep growing. But ultimately I feel it was the right decision. It might not seem that way right now. But I’m getting better each day.”

So firing squad or hanging? That is sort of how Derrick Rose sees the choice for opposing defenders when he is teamed on the floor with Brandon Jennings.

So how would you like your butt kicked, by Rose/Jennings or by Carmelo Anthony/Kristaps Porzingis?

“It’s hard for the defense where me and Brandon, we’re good off the ball too. We get in the right spots,” Rose said. “Brandon is a knockdown shooter and he’s good at creating and I’m good at creating and we’re just trying to make plays for other guys on the floor. ... We have KP on the floor sometimes with us and Melo at the same time and guys don’t want to leave those guys whenever we drive by them. So it’s our job to attack and make them make a decision. It’s really like pick your poison.”

Rose’s agent, B.J. Armstrong, Phil Jackson’s former Bulls point guard, reiterated his client’s sentiment he wants to stay in New York, adding he felt it was “a good possibility.’’

The Knicks can sign Rose to a three-year, $75 million contract extension beginning Dec. 22, taking him off July’s free-agent market.

“I think this just presents a challenge for him that he’s really embraced and I can’t find a better place to do it every night than Madison Square Garden,’’ Armstrong said Monday on SiriusXM Radio. “If you can’t find a way to get fired up to do it there in New York, you won’t find it. So he loves it there. I think there’s a good possibility [of re-signing].”

At 11-9, the Knicks are two games over .500 for the first time since they were 8-6 last season after a Nov. 21 win at Houston. They have not been three games over since the final game of 2012-13.