Definitely personal preference.....But to be honest, they're just two different types of paint flinger, you just need to see which one will be the most comfortable for you because they'll both shoot 15bps easy.
My opinion: Ego's all the way! (Etek FTW!)
I would go for an Etek over an 05 because they are newer so better software, nicer (my opinion!), faster, and often a lot cheaper.
Angels can be complicated to fix, Ego's are reliable as hell
Try some different markers out and decide whats best for you. If you are thinking of buying either of the two markers in question then your best bet is to try them out, our opinions might not be the same as you so don't make your choice purely by what we say!