Compare BAT Vk30 to Sonic Frontiers Line 2?

Can anyone offer an opinion on these two preamps when used with a tube amp, such as VT-100, and with B&W 802s?

Some think the SF is too lean, clean. Others think it is very neutral, detailed and musical.

Critics of the BAT think it is too dark, airless. Others think it is highly musical?

What's the real scoop?