Nikon D3300 vs Sony A3000, both camera are made for entry level shooters but we do have a big price difference here, Nikon D3300 cost is approx $646 with kit lens and Sony A3000 will cost you approx $398 with kit lens
Now if we look at the specification comparison table , we can clearly see that
Sensor: Nikon D3300 features more resolution and ISO range + absence of low-pass filter will give you better image quality than Sony A3000
AF points: Sony A3000 have more AF points than Nikon D3300, hence you get more area under AF with Sony A3000.
Continuous shooting speed: The Nikon D3300 have continuous bit fast continuous shooting mode compared to Sony A3000.
Videos: Both camera captures Full HD videos at 60fps.
Display: The Nikon D3300 have higher resolution display compared to Sony A3000, both have same 3″ size and Type (Fixed unit)
So if we look at the overall specification comparison, Nikon D3300 beats Sony A3000 almost in every field.
Verdict: We highly recommend you to buy Nikon D3300