I think you're kidding yourself if you don't have Tucker as the best FA available. The defense isn't special but he's an excellent hitter and baserunner. Since 2021 (his first proper full season) he's 10th in the MLB in wRC+ and WAR. Left handed of course which allows us to slot him neatly either at second or fourth in the lineup while breaking up our righties. Doesn't strike out and walks a ton which fits our team philosophy to a tee, and yeah he also has a career .234 ISO.
Only real concern with him is he's not the most durable guy out there. If that limits his ceiling to only 4.5-5 WAR every year you can live with it, but you're of course paying a premium for that value if he doesn't have odd years where he's pushing 5.5-6+ wins.
With that said, you're likely not getting both Bo and Tucker, so you gotta make the decision that if you must have one, which one is easier for you to find internal options to make up for the value, while giving you financial flexibility of making other additions. Tucker increases our position on the win curve and balances our lineup, with Ernie likely then doing his best to replace Bo, but it might come at the cost of not allowing us to shop at the top of the pitching FA market. Keeping Bo, seeing if Barger develops further, and signing a top pitcher could be more viable potentially.
It's a fun thought exercise, and as long as they can get one of those guys without hampering them from further additions then we'll be in a good spot regardless.