There is no single answer, as it depends on your bone volume, gum health, general health, how many teeth are missing, and your priorities on cost and timeframe.
Dentures are removable, need no surgery, can usually be made in a few weeks, and are generally the lower-cost option.
Implants are fixed, do not rely on clasps or suction, and help preserve jawbone, but require surgery, take three to six months, cost more, and are not suitable for everyone.
Implant-retained options sit between the two.
The right comparison is made after an examination and X-rays, with a written plan for each option so you can weigh them properly.