Well your post title is “Big Lake Boat” so I’ll tell you there is no other boat for big lakes like a Ranger 620 Fisherman. It is top of the heap when it comes to freshwater fishing rigs. I have owned Ranger Bass boats and they do not compare if you are looking for a true big water boat. The Ranger Fisherman series is simply the finest boat I have ever owned and I have had 2 Ranger bass style boats (an R91 and a 520) before this. No comparison although (especially the 520) those were terrific boats.
For the comment here that Rangers are too expensive….maybe so. But in this case you DEFINITELY get what you pay for.
Best of luck.