It depends on you like what type of implant do you wish to have on your brachiosaurus.
Every implant is unique.
Like brachiosaurus lacks speed so you can get endurance implant,
brachiosaurus lacks in healing ability so you can get recovery implant,
brachiosaurus is weak in dodging attack, for that agility implant is good,
Even stability implant is good for brachiosarus.
That is why it depends on you what type of brachiosarus you wanted.
Don't rely on others advice then you will be confused.