I think what ever works for you. For the first four years I did quilting I worked on one thing at a time and I have learnt now to extend myself a little and I have different projects at different stages. I took some time to get used to doing it but I think in the long run it has helped me try more things and I still get them done - just over a longer time span. Whatever you do - it needs to be fun for you. There are enough things that "need" to be done and done a certain way. I am not going to restrict my hobbie and pleasure activity to please others. Enjoy your own style and tweak it if need be.