LSP's or wax/sealants are all down to personal preference and what look you are wanting.
For light metalics you cant beat sealants, they bring out a true, cold metal look which seriously makes those colours look outstanding.
Poorboys world ex-p is polymer based and an excellent true sealant where as ex is carnuaba based so gives a slight warmer glow like that of a true carnuaba wax only more durable.
Finish kares fk1000p is an excellent wax based sealant which gives a nice look, not outstanding but never the less it certainly gives a stunning look with durability of up to a year ( dependant on wash regime, shampoo strengths used etc )
For durability i tend to use fk1000p or collinite 476s as they really are strong contenders in durability.
For warm glow I tend to go with dodo juice rainforest rub, juiced edition or rubbishboys original carnuaba waxes ( im a touch biased as im a dodo authorised detailer )
For dark colours that are wanting showcar wet looks then it has to be zymol carbon or swissvax onyx.
These are both equally as asthtetically pleasing but lack in the durability stakes ( top ups typically every 2-2.5 months )
99% of the true finish is within the preperation though so a good regime of washing, claying, polishing, glazing ( if neccessary ) then LSP.