I have 5 of these:
https://www.morebeer.com/products/speidel-plastic-fermenter-30l-79-gal.html ( I live in Europe, so I linked to morebeer as it shows the price in USD )
Very sturdy, very, very easy to clean, they seal off perfectly and they are pretty great overall. They are not conicals, but I don't find that an issue at this point. They are not see through, but again, this is not an issue. Maybe a bit pricey, but after 44 batches, I never had an infection, a bad batch or something negative happening, which could have been related to fermenters. So big thumbs up from here.