What size logs can a smaller portable sawmill cut?
It depends on the model, but many portable sawmills listed here can handle logs from 18" to 36" in diameter. Check for a "max log diameter" spec or similar on a specific model to match your requirements.
Are portable sawmills suitable for Australian hardwoods?
Many manufacturers & models are originally built (or least modified) to handle dense Australian species such as red gum, ironbark etc. Look for robust frames and high-torque engines, or if in doubt, ask your seller about suitability with denser wood.
What's easier to use, a bandsaw or swingblade portable sawmill?
Bandsaw mills give finer cuts and thinner kerfs, but swingblade mills are more portable and can handle varying log diameters without repositioning the log. Both have pros and cons for different applications, so reading model specs carefuly and doing research before purchasing will ensure you make the right choice for the job.