I'm traveling in a couple of weeks to Singapore via Frankfurt on UA First out of EWR. While nothing has opened up on LH out of the NYC area, PHL has first availability. I'm wondering if it is worth the switch. ANA (new first) is also now an option. I will be traveling with an infant and hence having an open seat would be great. I imagine that will be more likely on ANA or LH than UA. Additionally, if possible, I wouldn't want to "disturb" other PAX if I don't have to. UA has other F Pax while PHL is wide open and hence we may be the only passengers. ANA has 2 seats sold so far. Any thoughts on what makes the most sense based on hard product, service, etc.?

I've looked around for some comparisons but most of what I have found is Lufthansa business to united first or a straight LH business to UA business