1. Rydym ni'n caru: This is the most common and literal translation, meaning "we are loving." It's suitable for general expressions of love.
2. Rydym ni'n annwyl: This translates to "we are dear," and is more appropriate for expressing strong, heartfelt love, like "we love each other deeply."
Both phrases are grammatically correct, so you can choose the one that best suits your intended meaning.