How to interconnect 2 switches (Cisco/Dell) with trunks

Solution 1:

You don't need trunking at all - the two VLAN's are running on separate cables and you aren't using 802.1q on the Dell side.

The same commands you're using on the Dell (switchport access vlan xxx) will work on the Cisco side as well, as the syntax is actually derived from (read: copied) Cisco.

Solution 2:

Configure the Cisco side just like the dell side. Instead of switchport trunk native vlan 10 use switchport access vlan 10 and switchport mode access. If you wanted to trunk the VLANs you would use a single cable and run both VLANs across that cable. This configuration is just a couple of access ports.