I got two cheap ($40) shorts when I started cycling (well, one pair, then realized I had to have another while pair #1 was waiting to get washed). The thinnest chamois ones (Sugoi) are now used primarily for my 1 hr spin classes or trainer sessions. The next in line, Nike shorts for about the same price, has a slightly thicker padding, and I use those on outdoors rides of less than 35 or so miles. Over 40 miles, I get out my 3rd pair which I got later last summer a little before my 2 day ride, which are Pearl Izumis. And I also use Body glide for long rides but don't bother for shorter ones.

The PIs were not cheap but they have the thickest chamois and it does make a difference. I feel confident though that PI stuff lasts for years - I have PI gear from 1995 or so that is still going strong!

So it may be good to have some different options. But if you can only get 1 pair, get the very best ones you can.