Which Beryl Heart should I equip and what critical source should I take out?

1. The point is when 35 all becomes worth more than 21 attack. The exact point depends on your total attack and total main stat, but it does exist.

2. Do you have another link skill you'd rather use if you take out Phantom's?
Should be easy to find a ring with better stats than the Crit Ring, so I'd tend to replace that.