Buddhism in its pure form is about transcending and avoiding suffering. Helping others is virtuous but less important.
Christianity isn't about gratuitous suffering and in the right sense transcending it is OK. But what makes chrustianity superior is that it prioritizes helping others and in fact says you should embrace suffering for the greater good. This is seen as necessary and critical to both family, the core unit of society, and society itself too. We don't develop properly without people being willing to embrace suffering. And love is central, not just one of many emotions
Buddhism has a lot of good points to it, but these key points are why it is a fundamentally flawed worldview