The reason that why paṭisambhidāmagga-pāli by sāriputta is the best dhamma explanation

This topic should not strict in english version only, because the best buddhist book maybe didn't write in english.

I recommend paṭisambhidāmagga-pāli by sāriputta.

Content:

Clearly explanation of every important dhamma, which often appear in sutta, such as ñāṇa, dhammacakkappavattanasutta, vipassanā, pariññā, samatha, sīla, etc.

Reasons:

Sāriputta is in the middle of budhha, upāli, ānanda, atthakathā, buddhagosa, thai monks, and myanmar monks. So, if you can understand his concept, you can understand the whole theravāda canons.

The referene for above reason:

1. Sāriputta is tipitaka-memorizer who born in the same time with the buddha.
2. Sāriputta was announced by the buddha as the best teacher in Ekanipātā, Ekapuggalapāli:

   Bhikkhus, I do not know of any other person who could follow up the teaching proclaimed by the Thus Gone One other than Sāriputta.

   Bhikkhus, Sāriputta follows up the teaching proclaimed by me.

3. In the introduction of dīganikāya's atthakathā wrote that sāriputtas' students were co-designers of tipitaka's structure.
4. In Sutta. Ma. Mū. Mahāgosiṅgasālasuttaṃ, every leaders of 1st saṅgāyanā's members such as, kassapa, ānanda (sutta-memorizer), anuruddha, upāli (vinaya-memorizer), and their students (memorizer of abhidhamma and athhakathā), often go to listen sāriputta's dhamma explanation.
5. Budhhagosa used paṭisambhidāmagga as the main reference when he authored the path of purification, visuddhimagga.
6. The tipitaka-strict monks in Thailand and Myanmar are using visuddhimagga as the main reference to access tipitaka.