Is there a great difference between normal phong and blinn phong shading. Would you advise me to use blinn phong?

Blinn-Phong gives bigger highlights but that's not a disadvantage because you can just choose a bigger power value. Phong shading is maybe slightly better looking but while the difference is quite noticeable I don't find Blinn-Phong to be less realistic.

Blinn-Phong is less demanding on the pixel shader. If you are limited by the pixel shader (which is usually the case) I'd go with Blinn-Phong. Also, with Blinn-Phong you can move the halfvector calculation to the vertex shader.

Blinn-Phong requires less calculations. I just wanted to know if there're more advantages than disadvantages.

Normally you do the reflection/half vector calculation in the vertexshader anyway, so performance shouldn't be a problem - no matter what model you use.

Take a look at both models and take the one that looks better to you.