Yes the larger the capacity the more current it needs to make it bubble. With large capacities and small current there comes a time when there is no real need to control the voltage.
If the charging current is less than the Ah capacity divided by 20 then at least for short term use there is no real need for a charge control. If the battery is big enough
or the charge low enough then you may reach a stage where the self discharge prevents you from keeping it fully charged.
Things also depend on the plate material. High antimony content plates stand cyclic duty better than calcium and are used for heavy traction duty and the large industrial cells. They take more volts to gas and have a higher self discharge and will need a greater charging current to keep them in good condition
Calcium grid batteries have less self discharge and will fully charge with a lower voltage. They are more suitable for standby duty but they do seem more temperamental than the ancient rugged 5% Antimony plates.
There doesn't seem to be a foolproof and perfect battery for any particular job no more than there is the ideal way to treat batteries under various load conditions. What works best for a boat or caravan may not be the best way to treat a solar installation.
For solar and wet batteries there is not likely to be a voltage that you can set and ignore it. If you float at just below gassing voltage most of the time it should be reasonably fine but unless you have the extra charging capacity to give them a good equalising charge perhaps once a month and really stir up the electrolyte you may get stratification of the electrolyte, gas layer build up on the plates and in bad cases sulphating if your load is great enough. Even with 2 stage charging you may still need to equalise from a separate source every few months unless you have significant excess charging capability.
With only 50W of solar you will not be able to use a very big battery if you are using significant power unless you have a back up charging source to give it a boost especially if you have any days without sun.
Flux