Looks like you found your answer already, but in general there is a list of supported arrays and array rules.
For example - this command list all the default rules for diff arrays -
esxcli storage nmp satp rule list
I don't see any reason why you would want to change it unless you have the vendor's best practice which tells you do otherwise.
As you note, the policies can be different (as its a diff array).
In your case IBM and HP EVA are as follows-
# esxcli storage nmp satp rule list | grep IBM
VMW_SATP_ALUA IBM 2810XIV system tpgs_on VMW_PSP_RR IBM 2810XIV arrays with ALUA support
VMW_SATP_ALUA IBM 2107900 reset_on_attempted_reserve system
VMW_SATP_SVC IBM 2145 system
VMW_SATP_LSI IBM ^1742* system FAStT 700/900
VMW_SATP_LSI IBM ^3542* system FAStT 200
VMW_SATP_LSI IBM ^3552* system FAStT 500
VMW_SATP_LSI IBM ^1722* system FAStT 600/DS4300
VMW_SATP_LSI IBM ^1815* system FAStT DS4800
VMW_SATP_LSI IBM ^1724* system FAStT 100
VMW_SATP_LSI IBM ^1726-* system DS3X00
VMW_SATP_LSI IBM ^1814* system DS4000
VMW_SATP_LSI IBM ^1818* system DS5100/DS5300
VMW_SATP_LSI IBM ^1746* system IBM DS3512/DS3524
VMW_SATP_DEFAULT_AA IBM 2810XIV system tpgs_off VMW_PSP_RR IBM 2810XIV arrays without ALUA support
VMW_SATP_DEFAULT_AA IBM SAS SES-2 DEVICE system IBM SAS SES-2
VMW_SATP_DEFAULT_AA IBM 1820N00 system tpgs_off IBM BCS RSSM
~ # esxcli storage nmp satp rule list | grep EVA
VMW_SATP_DEFAULT_AP HSV100 system active/passive EVA 3000 GL [Legacy product, Not supported in this release]
VMW_SATP_DEFAULT_AP HSV110 system active/passive EVA 5000 GL [Legacy product, Not supported in this release]
VMW_SATP_EVA HSV200 system tpgs_off active/active EVA 4000/6000 XL
VMW_SATP_EVA HSV210 system tpgs_off active/active EVA 8000/8100 XL
VMW_SATP_EVA HSVX740 system tpgs_off active/active HP StorageWorks SVSP
VMW_SATP_EVA HSV101 system tpgs_off active/active EVA 3000 GL [Legacy product, Not supported in this release]
VMW_SATP_EVA HSV111 system tpgs_off active/active EVA 5000 GL [Legacy product, Not supported in this release]
VMW_SATP_EVA HSV300 system tpgs_off active/active EVA 4400
VMW_SATP_EVA HSV400 system tpgs_off active/active EVA 6400
VMW_SATP_EVA HSV450 system tpgs_off active/active EVA 8400