Thanks for the quick responses. I'm not much of an expert in planes and their differences. The specific flights I'm looking at are:
SU: JFK-SVO A 330-300, SVO-TLV 777-300 ER, TLV-SVO 777-300 ER, and SVO-JFK 777-300 ER
LO: EWR-WAW 787-8, WAW-TLV 737-800, TLV-WAW 737-400, and WAW-EWR A340-300
Does that change anything in terms of your recommendations - WB, NB, etc.?
Also, in terms of the planes themselves, service, or the respective airports for layovers, any notable differences?
And perhaps most important, is either consider more reliable to get me and my luggage where I need to go? Should the SU connection of 1:20 in SVO on the way there make me nervous?