As stated above, you would lose the E-Portal as that obviously Planet's own software and only relates to the SLs board (certainly at this time, and in any event, will only ever relate to Planet boards).
Having said that, there is a USB adapter available for the Virtue OLED boards, which currently allows for updating the board with new firmware, and installing new graphics. It may have further features in future.
I really comes down to whether you need those additional modes or not - if all you ever use is semi and ramping, the SLs board will already do everything that you need it to. If you need the recreational modes, and/or want the Virtue boards training drills (and those are the only real reasons I can see for changing boards) then obviously you would want to change boards, because you'll not get those features any other way. You do lose E-Portal, but some of E-Portal's features are available if you get the Virtue USB adapter.