Which one will suit for complete workflow design Temporal or Cadence

I wanted to design a complete end-to-end workflow orchestration engine.

It has the following requirements

1. Linear workflow
2. Parallel workflow - I wanted to execute n no of activities parallelly. After validates the results from all the activities I wanted to proceed to the next state or will fail the workflow
3. Batch - say I have 30 activities to be completed but I want this to be done in a batch fashion. Like if the window size is 5 then I wanted to execute 5 activities at a time T. After executing all the activities and validates the results will proceed further or fail the workflow.
4. Loop - wanted to run an activity infinitely until some condition meets
5. Child Workflow
6. Polling

All 1-5 are supported easily in Cadence workflow. I am not sure what you mean by Polling. If you can provide more details, I will update this answer to help you.

Here is the sample to execute activities in Leaner+parallel/batch+loop:

  @Override
  public long calculate(long a, long b, long c) {
    LOGGER.info("workflow start...");

    long result = 0;

    // Async.invoke takes method reference and activity parameters and returns Promise.
    Promise<Long> ab = Async.function(activities::multiple, a, b);
    Promise<Long> ac = Async.function(activities::multiple, a, c);
    Promise<Long> bc = Async.function(activities::multiple, b, c);

    // Promise#get blocks until result is ready.
    this.abPlusAcPlusBc = result = ab.get() + ac.get() + bc.get();

    // waiting 30s for a human input to decide the factor N for g(n), based on a*b+a*c+b*c
    // the waiting timer is durable, independent of workers' liveness
    final boolean received = Workflow.await(Duration.ofMinutes(2), () -> this.factorForGn > 1);
    if (!received) {
      this.factorForGn = 10;
    }

    long fi_1 = 0; // f(0)
    long fi_2 = 1; // f(1)
    this.currentG = 1; // current g = f(0)*f(0) + f(1)*f(1)
    long i = 2;

    for (; i < this.factorForGn; i++) {
      // get next fibonacci number
      long fi = fi_1 + fi_2;
      fi_2 = fi_1;
      fi_1 = fi;

      this.currentG += activities.multiple(fi, fi);
    }

    result += this.currentG;
    return result;
  }

And this is the sample of using ChildWorkflow.