For a 1 Gbps link between two Aruba CX switches, the appropriate SFP port type is an SFP (Small Form-factor Pluggable). SFP+ and SFP28 are used for higher speeds such as 10 Gbps and 25 Gbps, respectively. QSFP+ is for even higher speeds (40 Gbps).
SFP supports 1 Gbps (1000BASE-X)
SFP+ supports 10 Gbps
SFP28 supports 25 Gbps and above
QSFP+ supports 40 Gbps and above
Therefore, the correct port type for a 1 Gbps link is SFP.
[References:, , Aruba CX Transceiver and Port Type Compatibility Guide, , HPE Aruba Networking Switch Hardware Documentation, , Aruba Networking Best Practices for Link Speeds]
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