If I may add efficient too.
He counters aggressively like you said but with a dose of efficiency.

To be fair he's fighting another space god. Like helheim, the movie villain absorb and expand like like Ego, the living planet. The movie villain might be one of the strongest movie villain with the exceptions of the ones from the Taisen movies.

Ryuki Survive has a poor track record, though.

Love Shinji, but I feel Survive made him equal to the aggressive Riders, and only gave him a real advantage against the mirror monsters.

One who got owned by a Mecha Space God?

Happens to Darkseid every other blue moon, not unreasonable.

I'm going to give this one to Tendou Souji, hands down.

He strikes me as one of the few Heisei riders that doesn't seem like he's totally winging it.

Kamen Rider Amazon Alpha, or at least he's a decent contender.

Skill wise the guy barely looks like he trying.

On a non skill matter, Violent Emotion Decade (I know, I know) can counter most other riders, even without specifically using their own powers against them.

Then of course, there's Zangetsu, who needed 3 other Riders backstabbing him and Flashback-no-jutsu to defeat him.

As I mention before Decade has the best feat since he did defeated the most riders canon or not.

Well, I guess I should ask are we talking about most powerful or most skilled?

Tendou's definitely the most skilled, but most powerful, I would cast a vote for Kuuga. The guy's rider kick could destroy everything within several city blocks, and that's just his SECOND upgrade form.

Well Knight also got Survive mode he was not that much better. To me Shinji was a badass rider who died at the end being a Kamen Rider.

Yeah but that villain stole his power so give him some credit and he defeated that villain in the movie. So it still stands that he a strong rider in the end.