Which chess opening is the best for intermediate(1000-1600 rated) players?


It looks like you gave the incorrect answer to your own question.
I consider players Ranked below 1,000 as Novice
I consider players Ranked between 1,000 to 1,300 as Beginners
1,400 to 1,700 as Intermediate
1800 to 2000 as Advanced
2100 as Expert
2200 is often Master ranked players.
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1. Ruy López - Advanced Level Opening
2. Italian Game - Beginner Level Opening
3. Sicilian Defense - Intermediate to Advanced Opening (depends on line)
- Sicilian Dragon - Intermediate Opening
- Sicilian Nadjorf - Advanced Opening
4. Queen Gambit - Advanced Opening
5. Caro-Kann - Beginner Opening
6. French - Beginner to Advanced Opening
- French Winawer - Advanced Opening
- Exchange French - Beginner Opening
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Openings are usually ranked above the tier of the player that uses them.
For example:
‘Ruy López is advanced Opening, but a player who is Intermediate will most likely play it

The Thank You Award you sent me was very nice Sushanto.
Your Most Welcome!
Due to your kind gesture, I have decided to share with you 5 of my top secret Intermediate lines which you can play at your chess level.
I will also share with you 3 of the most powerful lines in all of chess.
They are so deadly some chess players around the world fear them and try to avoid them!
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Line #1 - The Grand Prix Attack - Intermediate Opening
Line #2 - Lizard Defense - Intermediate Opening
Line #3 - Staunton Gambit - Intermediate Opening
Line #4 - The Orangutan Opening - Intermediate Opening
Line #5 - King’s Gambit - Intermediate Opening
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I consider the above Openings Intermediate because of 2 very important reasons:
1 - The player who uses the above lines needs to have good tactics.
Beginners or Novice players don’t have the good Tactics because they are fairly new and they might not know about doing tactical puzzles or practice with friends.
2 - The player who uses the above lines needs to know how to use the initiative and they need chess instincts.
Beginners and Novice players don’t know when to attack or not to attack. They are very 1 dimensional. They are either full aggressive or full passive. They don’t know when to switch from passive to aggressive or aggressive to passive.
Intermediate players have this ability. They are like Lions lurking in the grass.
They are waiting for right moment to strike and pounce on enemy.
Intermediate players have feelings when they think they are winning or they have feeling when they think they are losing.
When they think they are winning, they can be extreme aggressive and intimidating.
When they think they are losing, they can be extremely defensive like fortress. It can be very frustrating to some players and it can cause then to mess up due to frustration of their good defense skills.
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Deadly Line #1 - Catalan - Advanced Opening
Impossible to break through the Catalan!
Deadly Line #2 - Nimzo Indian Defense - Advanced Opening
Some players don’t play Nc3 and instead play Nf3. Why? Fear!
Deadly Line #3 - Grunfeld - Advanced Opening
Some English players try to avoid Grunfeld by playing c4 + Nc3 + e4 to prevent d5. Than they play d4. Why? Scary Cats!