BTC leads alts follow. If you want relative stability, then BTC is the best bet, but whenever BTC takes a breather then the alts rise, which we saw last week. You can try a method of being in BTC and moving to LTC whenever BTC takes a rest, but it will be hard to time. Especially since when BTC falls, it can take the alts with it. BTC will usually go up first, but LTC will go up more percent wise overall. If you can time things right then you can benefit from both rises. Best strategy is to put some in both.