I have done all three.

Poo scraping is my least favourite, as my scraper (or poo sword, as it's called here) will never be completely clean, and I think it's gross.

Flushable liners my second least favourite. DD manages to get her poo half on-half-off the liner, or they hang out the side of the nappy, they're a PITA to cart around, and they're not great on her skin. Not really that expensive, I don't think, I paid $12 for a roll of 100, which you can cut in half to make 200.

DH built a DIY LS, only used a 7-speed hose nozzle for it. It was far and away the best option. It was out of action for a while while we moved though, and haven't quite got back into it yet - there's been a lot to set up, and we're in the formed poo era of DD's life (except on kiwifruit days) so it's not a big deal.

We also had a two storey house at the old place - changed upstairs, toilet downstairs. Found it easiest to just leave the pooey naps in a separate bucket and do them at the end of the day. Also, for the first 5 months of her life, DD was a twice a week kinda kid, so we didn't really have to think about it all that often.