I think pretty much everyone has asked you which way north is. This is because orientation is so key.
Nobody can tell you which is the best plan for your block, unless we know which way your block faces.
Get it right & the living rooms will be light, warm in winter, cool in summer, bedrooms will be cooler in summer.
Get it wrong, & the living areas could be dark, & cold in winter. Or blazing hot in summer. Even worse, unbearably hot bedrooms on summer evenings.
Aim for living areas to face north. Bedrooms to face south or east. Limit or eliminate west facing glazing, it's best to locate the garage, the laundry & bathrooms on this side.
Orientating your home this way is called "passive solar design", & is critical when designing a comfortable, energy efficient home,
https://www.yourhome.gov.au/passive-designPlan 1 could work well for an eastern frontage, as living areas would face north. However the rear bedrooms would both have west facing windows, a very bad idea. These could be changed to a south window, & a north window.
But this only works if the frontage is east facing.
As mentioned, no matter which way Plan 2 faces, living areas will never have access to winter sunshine, or light. It's a terrible plan from a passive solar design point of view.
Also make sure the roof is designed well for a solar PV system. This will pay for itself in only 2-4 years in most cases, & will greatly reduce (or even eliminate) your electricity bill.
The roof must be designed to have a large area facing north, west or east. Multiple faces & lots of little triangles (common with Australian roofs), complicates a solar install (increasing costs), limiting the number of panels.
eg. Looking at Plan 1, if it's an eastern frontage, there would be a nice north facing roof, over the living areas. But this is complicated, & minimised by the "valley" where the also starts. It would be better if this was all one northern face.