I haven't played a lot too, I think it was about 5 leagues since I came back this year. I still feel BUG being awesome. I looked at the lavinia survival with mox diamond and didn't like it that much compared to the bug version, but more in the playstile sense. It's way more all-in, doesn't have DRS to control better the game, etc. It's more of explosive and combo-oriented, while the bug version is better as a midrange deck, and I feel like I win a lot of games with that role of midrange deck. The Lavinia list sounds more explosive, and have a relevant chance of deploying Lavinia turn 1, which can by itself just win some games. I'm still doing well so far with bug, this week got 2 4-1's losing both times to guttershark on storm. I think both versions are good at slightly different things, I would definitely keep an eye at how the lavinia version goes.
But Lavinia in the BUG version (which... is also white) didn't work out. With that setup having DRS instead of mox diamond, we can have lavinia or leovold turn 2. And in that scenario, leovold is way better.