Fielder and Axio are JDM cars. Parts would be tough to procure as a result. They're not true Corolla successors in terms of size and product placement the way we know them to be. The Sylphy B17 is known as Sentra and Pulsar in other markets but the core B17 chassis and drivetrain remains similar amongst a multitude of markets. The Nissan 1.8 MRA8DE engine is adequately powerful and fuel efficient. Parts generally would be easier to get especially if you like to DIY for maintenance and shopping online for parts. Remember this is not a comparison between a B15/N16 and a NZE where the latter is the superior product imo, but specifically to the B17 vs the Axio, my bid will go to the Nissan this rounds.