Depends how much you plan to get caught out in the rain of even ride in it cause you want to ride. The ones made for motorcycles are light weight and pack up real well.
They are still strong and hold up you pay for the quality and light weight. I like the HD ones but should be bought when on sale.
Some of the normal rain suits you buy for work are OK if you do not use them a lot and sell for 40 dollars, a bit bulky but work well. For a rain suit I like to see Britte colors and reflective tape. If your wearing it others on the road have reduce vision you are the last thing they are looking for... be seen.
Also consider boot condoms they are slip overs for you boots they are low cost and work great. IMO the ones with an open bottom are best the ones with soles on them slip to much.
Rain gear is a live and learn thing get wet decide what works best for you. Rain on a touring bike is a lot different than a softail. I can ride in a light rain and stya dry some sometimes.
And when you need it the rain gear will be at home