firsly it's known as the weak nuclear force, not the strong. (w+, w- and Z particles)
Fusion has a much greater release of energy, (fission of u235 is about 10 * 8, fusion of D - T is 10 * 8.4 and Lh2/Lox is 10 * 1 per unit of mass/energy)
- (all results are mathematically rounded)
Fusion...