The Apogee is great if you have other 1/70th scale rockets (ie: 1B, Little Joe, Gemini Titan, Mercury Atlas, etc) to display it next to.
The Apogee was great if you wanted to fly a large Saturn V, but not so large you needed a LEUP. With LEUPs no longer required for APCP motors, this point becomes moot.
The Apogee kit is probably as large as you can fly, without needing a waiver on account of the 3.3 pound limit.
Not certain about the Sirius Rocketry kit having more detail, but i'd trust Troj on this.
My Apogee Components Saturn V build:
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Sirius Rocketry Saturn V build:
https://www.rocketryforumarchive.com/showthread.php?t=45421&highlight=sirius+rocketry