There's no yes or no answer. Personally, I still miss my flasher (a very old style of depth sounder) because it gave a sense of the how 'hard' the bottom is as well as how far down it is.
Some of the
fish finders also give some idea of the penetration of the bottom. That can help you figure out if you're over weeds, soft mud, hard mud or softish sand, hard sand or rock... and so give you one more tool in figuring out whether to try to
anchor and which
anchor to try first. Many of them give you a track, so you can see very visibly the bottom trend.
Most of the 'sailboat'
instruments just give you a digital number.
As to whether it's worth it for you, you're going to have to do your homework. Find out what kind of thru-hull or in-hull
transducer you can use and how much it costs. Figure out if this is an
installation you can do or if it needs to be done at a yard. (You might want to use the yard quote anyway, because your time isn't free and you may need additional tools, materials, etc.) If your
boat is in the
water and you're installing a thru-hull, you're going to need to
haul out anyway.