I don't think there can be a 'favorite' necessarily since they all have a specific use. To stay in tune and also use the whammy for more than vibrato, Floyd is the best. First light bar work, something like a 2-point trem, say a Gotoh 510, is best. For a lower bridge, stratier tone, vibrato/short dives then a screw-in strat bridge is best. Les Pauls with anything other than a stop tail is not a Les Paul in my (biased) mind. Fixed trems do the drop tuning thing best. What would be great is a tremolo that can be like a floyd or 2-point, but be able to pull a lever to set it Fixed against the bridge cavity. I don't have any Floyd style bridges right now but am preferring them these days just to stay in tune with bar use.