разница есть, только небольшая + разница в производительности.
die
die "Hello world!";
Transactions: 250 hits
Availability: 100.00 %
Elapsed time: 10.04 secs
Data transferred: 0.00 MB
Response time: 0.01 secs
Transaction rate: 24.90 trans/sec
Throughput: 0.00 MB/sec
Concurrency: 0.17
Successful transactions: 250
Failed transactions: 0
Longest transaction: 0.04
Shortest transaction: 0.00
exit
exit "Hello world!";
Transactions: 250 hits
Availability: 100.00 %
Elapsed time: 6.05 secs
Data transferred: 0.00 MB
Response time: 0.01 secs
Transaction rate: 41.32 trans/sec
Throughput: 0.00 MB/sec
Concurrency: 0.27
Successful transactions: 250
Failed transactions: 0
Longest transaction: 0.04
Shortest transaction: 0.00