Julian,
Hello from Perth!
I went with the Odyssey. Had it in my car for the last 4 years. No issues. Costs more then Optima. But the weight difference is huge. If I recall the optima weights 60#. The odyssey was under 40#. So for weight advantage the Odyssey was the way to go. Summit racing carries both.
The downside to the Odyssey is its reserve capacity. It is about 1/2 that of the Optima. So it you have a drain or forget to switch off the key; it can run down quicker. I have a cut off switch to kill the battery. That as saved my butt a few times.
I am very pleased with the Optima with its ligher weight and smaller size.
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