Lets understand how GCeasy & yCrash differ from each other in the following table.

What is the purpose?GCeasy is used to optimize Garbage collection pause times & throughput.yCrash is an end-end root cause analysis solution. It answers the questions: Why did your application slow down? Why did the CPU spike up? Which objects in memory are causing memory leak? Why are GC pause times so high? Why is response time degraded?
What does it analyze?GCeasy analyzes Garbage Collection log only.yCrash analyzes 360-degree artifacts of an application. It analyzes:
a) Garbage Collection log
b) Thread dump
c) Heap dump
d) top 
e) top -H
f) netstat
g) vmstat
h) disk usage
i) IO Stat
j) lsof
Data TransmissionSomeone has to manually capture the Garbage Collection log file and manually upload it to GCeasy tool for analysisyCrash agents automatically capture 360-degree data from the server and transmit to yCrash server to do root cause analysis instantaneously
Problem ForecastingGCeasy can’t forecast the application’s performance problems.yCrash’s micrometrics monitoring capability facilitates user to predict the problem even before it surfaces in production
Dashboard, Search, CompareGCeasy doesn’t provide a dashboard. It also doesn’t provide Search and Comparing capabilities.yCrash provides one dashboard, where you can see all historical crash analysis in one place. It also provides the capability to search historical incidents. You can also compare between two reports in yCrash.
SecuritySRE engineers have to transmit Garbage collection log files from servers to developers manually. GC logs are then stored in the developer machines. Then Developers upload these logs from their machines to GCeasy for analysis. In this process log files are distributed and stored in multiple locations (Server, SRE engineer machine, Developer machine).yCrash agents securely transmit log files (through HTTPS) to yCrash Server for analysis. Log files are not stored anywhere else.
IntegrationIt exposes REST API for integration with other tooling.Besides exposing REST APIs, it also provides plugins to integrate with APM tools such as New Relic, App Dynamics, Dynatrace, …. It also provides integration with ticketing systems such as JIRA, ServiceNow