The Interval and Spire fly almost identically (12/5/-1/2). Go with the Interval - it offers more plastic and weight options (0 blends), is easier to find, and costs less.
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FAQ
Is the Interval or Spire more overstable?
They are equally stable (both +1) - turn -1/-1, fade 2/2.
Should a beginner pick the Interval or Spire?
Both rate the same for beginners (33/100). Pick by feel and price.
What is the difference between the Interval and Spire?
The Interval and Spire fly almost identically (12/5/-1/2). Go with the Interval - it offers more plastic and weight options (0 blends), is easier to find, and costs less.
Which is cheaper, the Interval or Spire?
The Interval is cheaper, starting around $17.99 vs $18.95.