Which calligrapher is better to learn official script with a pen?

In fact, there are many inscriptions on the official script. As a beginner, I suggest these are better.

Cao Quanbei.

Ritual tablet

Zhang Qianbei.

very good

Cao Quanbei's calligraphy is very beautiful.

The sacrificial tablet is rough and majestic.

Zhang Qianbei is simple and ancient.

Come on!