Quick answer
For most Australians, CoinSpot is the clear CoinJar upgrade. 7× more coins (490+ vs 67), stronger publicly disclosed security (ISO 27001, Mazars proof of reserves), 24/7 Australian-based live chat, and via Markets you get 0.1% fees vs CoinJar's 1% consumer app.
If you specifically want the crypto card experience, you might not need to switch — you might just need to use CoinJar Exchange (the separate order-book platform, not the consumer app). It offers 0.10% fees, letting you keep the Card benefits while paying more reasonable fees.
For active traders, IR or CoinJar Exchange itself. CoinJar Exchange (0.02% maker at $1M+ volume) is actually competitive with Independent Reserve at institutional volumes. Retail traders should choose based on other factors.