Just some inquiry I want check before making up my mind to get this tabpro 8.4.
is it easier to use than ipad mini?
depends on individual preference. best for you to go down to a store to try.
is this laggy?
maybe a little for highly demanding tasks? then again, perception of lag also depends on individual. best for you to go down to a store to try.
Are there better option for me to choose from?
i would probably say that its equal or rival would be only the ipad mini 2? for other alternatives, they will definitely be less powerful (LG G pad 8.3, Galaxy Tab 3 8.0, upcoming Galaxy Tab 4 8.0 etc...)
if not, you can wait for the rumoured Nexus 8.9 as well, though that will take quite some time...
Will this be able to last me for two years?
definitely if you take care of it. just don't toss it around and all.