What is the biggest difference between Dell EMC PowerEdge Rack Servers and HPE ProLiant DL Servers?

In my perception, Dell is on a more bleeding edge of technology, as HP is a more traditional technology company. If you are capable of technical skills to perform manage, control, diagnostics, preventive maintenance Dell EMC PowerEdge Rack and HP ProLiant DL Servers are almost the same, with some slight differences in technology implementations. I heard that Dell comes with a free lifetime license for Management software whilst the HP Management software pack is not free.

The differences typically fall under the hood or are more soft differences. In general, servers are commoditized and in most environments, HPE and Dell servers are mostly the same. HPE has done a lot more with developing the Silicon Root of Trust and are considered more secure, but ultimately most companies don't actually need this. I'd equate them to a Mercedes vs a high-end Honda. Both get the job done, both are nice, one has extra functions that may not be useful.

Also, Dell has an integrated dual-microSD, HPE uses a USB dongle for that functionality.