推荐回答（4个）
唐玄宗时期是大唐最鼎盛的时期
贞观之治
唐太宗和贞观之治 唐太宗李世民唐太宗即位后，励精图治，纳谏如流，使得唐朝国运蒸蒸日上，唐太宗更是成为一代有为之君。 对外方面，太宗时期将原为突厥所支配的蒙古高原纳入势力范围，唐朝北方的诸民族专称李世民为天可汗。唐太宗派文成公主与吐蕃赞普松赞干布通婚，稳定了唐蕃两国的关系。 在内政方面，唐太宗承继了宰相制，发展完善和确立了后世运用的三省六部和科举选士制，推行均田制、实行租庸调制。 在官职制度上，则承继了秦汉以来的宰相制度，发展并完善了隋朝所开创的三省六部和科举选士制，为后世所效仿。唐太宗不计出身，网罗了一大批精明强干的大臣，比如房玄龄、杜如晦、长孙无忌、魏徵、马周、高士廉和萧瑀等文臣，尉迟敬德、李靖、侯君集、程知节、李绩和秦叔宝等武将。 这时期社会秩序安定，政治清明，经济得到恢复和发展，历史上称为“贞观之治”。《资治通鉴》记载，贞观四年（630年）一斗米不过三、四钱，全年死刑犯仅廿九人。其政绩的总结《贞观政要》成为日本和朝鲜的帝王教科书，亦为后世君主模彷学习的对象。
开元之治
唐玄宗和开元之治 唐玄宗统治时期堪称大唐最辉煌的岁月，同时也是唐朝国势由胜入衰的转折点。后世史学家常感叹大唐盛世是瞬间的没落。 李旦继位以后，称睿宗，其妹太平公主与其子李隆基发生权力之争，睿宗左右为难。延和元年（712年），睿宗让位于太子李隆基，是为唐玄宗，又称唐明皇。先天二年（713年），太平公主本欲发动政变，却被唐玄宗提前反制，最后被赐死于家中，其党羽或杀或逐，结束了武后以来女人参政的局面。同年改元开元。唐玄宗在位44年，开元年间政治比较清明，任用姚崇和宋璟等贤能为相，经济迅速发展，农业上发明了曲辕犁和筒车，使得农业生产力大幅提高，国力迅速上升，唐朝进入全盛时期，史称“开元盛世”。这一时期被一些现代史学家认为是继汉武帝时期之后，中国历史上出现的第二次鼎盛局面。当时唐朝已成为世界上最强盛的国家，首都长安城一度成为当时世界上最大的城市。
就综合国力而言，显然后者统治前期更盛，经济，文化，军事，外交都取得了空前的繁盛，可谓是中国封建时代的鼎盛。
不过就政治制度而言，唐太宗时已经较完备，与玄宗时并无二致。
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