400G optical transceivers, but which form factor?? OSFP or QSFP-DD?

Before adopting 400G, It’s crucial to understand 400G is available in two physical form factors: QSFP-DD and OSFP. So how do they compare?
OSFP “Octal Small Form-factor Pluggable” and QSFP-DD “Quad Small Form-factor Pluggable - Double Density” are very similar standards overall with a few standout differences. The Data Center Dude explains in detail.
The Data Center Dude is presented by Approved Networks.
Approved Networks is the industry leader and authority in programming, testing and distribution of quality OEM alternative fiber optic cables and transceivers.
100% compatible: GBIC, SFP, XENPAK, X2, XFP, SFP+, CWDM, DWDM, 10G Bidi, 10G/40G/100G Twinax, 40G QSFP+, CFP, CFP2, CFP4, 100G QSFP28 optical transceivers and fiber optic cables for virtually every manufacturer of networking hardware today.
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