Neo icos generally have performed better but there is less competition there is suppose. This again can be both an advantage and disadvantage.
Fewer number of icos means that investors have fewer options available to them, but it means its easier to make picks(inflexibilty/limitations in choice can sometimes be a strategic advantage).
Further the higher costs of development in NEO 10k or 500 gas development costs as opposed to 100$ on ether do mean that project on neo end up being stronger, while it also helps to weed out a good deal of the fraudulent icos.
Give me your take
You are right in your statement, although NEO platform is new, but we cannot predict its future, and aside from that, fewer competition means a good to business, in fact, its more profitable when there is no less competition, but on the other hand, ETHER is widely used, and almost all of the incoming and outgoing ICO's out there are Ethereum based platform, and so, it is being adapted by many developers., which is a good side of ethereum.
I think its better to focus on NEO this time, and currently, im searching ICO projects that are NEO based. Who knows, we can do a lot with NEO.
Have a good day