IOS question: Difference between Ipbase, ip services and LAN service, IOS and IOS XE

Hello engineers, I am under impression that ipbase is purely applied when we are using for example 3850 catalyst as core/aggregate and we require lot of routing features available. Where as ipservices is purely for access layer swtiches ?

On the very page I am new to IOS XE ,heard versions prior to 3.06.4 have few to many issues. How different is IOS XE compared to regular IOS version 15.2 etc on same catalyst 3850 swtiches ? (note that I am just taking 3850 as example as it is a LAN based switch that can take role of core swtich or aggregate, and the UPOE versions like 3850 48X can take role of access layer for WLC, AP, IPHONEs etc). Can you guys also help me understanding different versions of IOS like -universal- ? Also 12.2(33)SXI3 is when you we have to upgrade a 6500 in to a vss swtich ? Does VSS have their own version of IOS ?