I recommend 女王の教室 with Japanese subtitles.

<a href="https://www.italki.com/discussion/224347" rel="noopener noreferrer" target="_blank">https://www.italki.com/discussion/224347</a>;

I recommend シン・ゴジラ with Japanese subtitles.

<a href="https://www.italki.com/discussion/224347" rel="noopener noreferrer" target="_blank">https://www.italki.com/discussion/224347</a>;

There is a lot of interesting dramas in Japan

Deciding the best drama is difficult for me because each drama has the plus side.

Besides, we can't decide the best drama only from audience rates because the recent averages of audience rates are lower than the averages in the past.

However, I recommend these dramas based on the recent averages of audience rates.

「ドクターX～外科医・大門未知子～ SEASON 6」was ranked at the top of the audience rate in 2019, 18.48％.

Michiko Daimon is called Doctor X, she is a superior surgeon, she can cure any diseases by her surgeries.

She doesn't give in to authority, she often gets into desperate situations, but she and her comrades overcome them.

Doctor X series are sometimes serious, sometimes funny, and always exciting!

Here is the information of ドクターX series.

<a href="https://en.wikipedia.org/wiki/Doctor-X:_Surgeon_Michiko_Daimon" rel="noopener noreferrer" target="_blank">https://en.wikipedia.org/wiki/Doctor-X:_Surgeon_Michiko_Daimon</a>;

The second in 2019：「相棒 SEASON 17」15.3%

相棒 means buddy, 相棒 is a police drama, since the speaking speed of 相棒 is slower, it may be good for practice Japanese.

Here is the information of 相棒 series.

<a href="https://en.wikipedia.org/wiki/AIBOU:_Tokyo_Detective_Duo" rel="noopener noreferrer" target="_blank">https://en.wikipedia.org/wiki/AIBOU:_Tokyo_Detective_Duo</a>;

The top in 2018：「99.9-刑事専門弁護士- SEASONⅡ」, 17.39%

99.9 is a series of lawsuits story. 

Since I really like watching lawsuits stories, I always get excited by those stories.

The main character is a lawyer of criminal cases, he always acts in order to prevent false charges.

The conversations between him and his comrades are funny.

The second in 2018：「リーガルＶ」, 15.61%

リーガルＶ is a lawsuits story, it's also funny and exciting!

Here is a list of the audience rate in 2019.

<a href="https://dorama9.com/2019/10/10/dorama-rating-2019-autumn/" rel="noopener noreferrer" target="_blank">https://dorama9.com/2019/10/10/dorama-rating-2019-autumn/</a>;

Here is a list of the audience rate in 2018.

Here is an audience rate of the dramas on the air now. 

<a href="https://artv.info/ar2001.html" rel="noopener noreferrer" target="_blank">https://artv.info/ar2001.html</a>;

「トップナイフ」is ranked at the top, 13%.

トップナイフ is a medical drama, I watched the first episode.

The story is interesting!

The characters are unique and sometimes funny.