LoadRunner and NeoLoad are considered the top two best performance testing tools on the market.
Performance testing is a critical component of the software testing process. It determines the actual operational boundaries that will simulate the real world use of an application. Performance testing is load testing, stress testing and scalability testing.

As you have asked about the comparison between Neoload nad load runner, i am giving you some information about it


Criteria
Loadrunner
Neoload

Commercial License

Yes
Yes

Launched By
HP
Neotys/NeoLoad

Protocol Coverage
It supports more than 30 protocols including enterprise software SAP
NeoLoad has good support of more than 40 Protocols. It supports enterprise Applications SAP, Oracle Siebel etc.

Record and Playback capability
Yes
Yes

Image Based Recognition
Yes
Yes

Text Based Recognition
Yes
Yes

Real Time Test Monitoring
Yes
Yes

Result Reporting
Yes
Yes
Cost

Expensive
Low when compared with the Loadrunner

Load Generation
Depending on Type of License
Depending on Type of License

IPSpoofing
Yes
Yes