Hi,
I suggest you to go through the release notes of both the versions before you proceed.
for 8.6.1
http://www.cisco.com/c/en/us/td/docs/security/asa/asa84/release/notes/asarn86.html#wp81861
for 9.1
http://www.cisco.com/c/en/us/td/docs/security/asa/asa91/release/notes/asarn91.html#pgfId-614224
Because any of the specific function you use might be an caveats here. So it worth reading the release notes before you.
But as far as i see both the OS are suggested by cisco as an preferred one.
Suggested ASA SW:
9.1.2
9.0.3
8.6.1
With respect to caveats 8.6.1 is considered as an stable one which has very few unresolved caveats.
Table 3 Open Caveats in ASA Version 8.6(1)
DDTS Number | Caveats |
|---|
CSCtr71193 | reload not performed when IPS software module in recover state |
CSCts89380 | Saleen: ASDM Handler does not support envmon psu power input sensor |
CSCtt98015 | Saleen: crypto engine archives continuous after license upgrade |
CSCtu59747 | Saleen: need to wait for 1 minutes before issue show inventory |
CSCtv22976 | Saleen crashed after negative test against tunnel limit |
CSCtv27382 | RDP and ICA plug-in issues with Saleen |
HTH
Regards
Karthik
