Re: Im new to all this
There are various factors that contribute to the quality and cost of a fly line. As a newer fly angler, you do not need to purchase an $80 plus fly line. The lines core, its outer coating and the manufacturer all factor into the cost of a line. Taking care of your line, any line, will greatly extend the life of it, even a heavily used line.
Realistically, you are talking about two different tapers when you are looking for a Trout line and a Bass line. Most of your Bass flies are larger, heavier and more wind resistant. Therefore, you want a line with the majority of the grain weight towards the front or "head". This makes fly turnover easier and it also makes it easier to throw those bigger flies into a wind.
As for Trout, you could use three or four different tapers, all depending on rod, flies, waters fished, etc.
Hope this helps.