There's no right or wrong here, just need to decide what you want from this build. If you think you need the option for further expansion, then something based on option 1 is probably better for your needs.I guess there are a few issues with the A300.
Not many connections on mobo back plate. Sodimm. No place for dedicated GPU if decided i wanted one in the future. Limited as to what CPU cooler i can use.
Maybe i should go with spec 1?
I would however strongly suggest looking for RAM that has Micron E-die, such as this one above, as it probably has the best price to performance (but it'll be a bit more expensive than the RAM in option 1). Some people might have managed decent results with Hynix, but for simplicity I'd suggest to try and avoid Hynix for Ryzen builds.I'd suggest looking for something like the Ballistix Sport LT 16GB (2 x 8GB) DDR4-3200 BLS2K8G4D32AESBK which can be found for quite a bit cheaper.