“XX是最好的XXX，没有之一”英文怎么说

XXX is the best XXX, not a best XXX
觉得这句比较好了，a 和最高级的特殊用法
比如he is the best teacher in this school;
he is a best teacher in this school;
前一句的意思是他是这个学校最好的老师
后一句的意思是他是这个学校很好的老师
基本能表达你要的意思了，也不会那么别扭

XX is the best XXX,also the only of the best.
这句话中文看起来不错 但用英文有些别扭

XX is the best XXX, not just one of the best.

写给女孩的吧，XX is second to none in XXX's heart

XX is the best the one of XXX, it's the only one.