Lol. These are the same energy, Antimatter is just slightly faster than fusion, but both generates energy because of E=mc². But the issue with Antimatter is ... How to get it ? ^^. Particles Accelerators ? lawl.
Ultra Intense Laser + Paper-thin (less than a millimeter) gold film is able to artificially generate matter and antimatter, however that antimatter has too much energy and therefore must be slowed in a particle "deaccelerator" to be usable, otherwise its kinetic energy is too high to be confined by magnetic fields, causing its anihilation.
"cold" antimatter (antihydrogen) if mixed with normal hydrogen results in the classic E = mc².
If you are able to confine antihydrogen well enough, you could theorically fuse them together in a fusion reactor to form antihelium.
Particle accelerators can use nucleus-nucleus collisions to create antimatter, Beta+ decay naturally generates antimatter.
Antimatter is very close to matter, except for the opposite charges.
For example there may be parts of the universe that antimatter is prevalent, with antihydrogen being used on stars for fusion producing antihelium and heavier elements like antigold, antiuranium may exist too...