| First Fit | Allocates the first available block large enough. | Fast allocation, simple to implement. | Can lead to fragmentation, suboptimal use. |
| Best Fit | Allocates the smallest available block. | Minimizes wasted memory, better utilization. | Slower allocation, external fragmentation. |
| Worst Fit | Allocates the largest available block. | Avoids small fragmentation. | Inefficient memory use, slow allocation. |
| Next Fit | Allocates the next available block after the last allocation. | Faster than Best Fit, reduces initial clustering. | Fragmentation, suboptimal memory use. |