SS Breloom
Pros
Can Poison the defending Pokemon for C
Can hit active for 50, witout applying Resistance
Slightly easier to pull (Uncommon vs Holo)
Can build up faster in a G deck (SS Shroomish Growth Attack)
Can Apply Weakness to its attack
Cons
Not completly Splashable
fighting: :colorless :colorless attack)
Has to use its attack to Poison
The only resistance to Grass is Metal, and Metal Energy still reduces attack
Can only hit active Pokemon
10 less HP
SS Cacturn
Pros
Can Posion without attacking
Completely Splashable (Cacnea, :colorless and Cacturn, :colorless :colorless :colorless )
Can hit any Pokemon for 40 without applying any effects on attack
It looks cooler in your deck (It is a Holo after all, though not really a pro/con issue...)
Can hit active Metal type for 40 every time, despite # of Metal NRG on it
10 more HP
Cons
Well its PokePower makes it more seceptable to certian cards (Muk EX, and others)
Can only hit active for 40
Cannot apply Weakness to attack
If it is not attacked for actual damage, its Poison Payback doesnt work
Harder to Pull (Holo vs UC)
BOTH
w/:fire: - tie
no r - tie
1 retreat - tie
Stage 1 - tie
3 Energy to attack - tie