For a Single 100Ah battery flooded or AGM, I would recommend the Iota DLS-30, as it is enough amperage for a later upgrade to a pair of GC-2 golf cart batteries.
For starting out with a single pair of 208+AH of golf cart batteries, I would recommend the progresive dynamics PD9245, either the 14.4 or 14.8v model as 15 more amps and the ability to choose one of three target voltages is a very desirable feature.
I would not buy ANY of the garage 'smart' chargers for use on a regularly deeply cycled battery. These are good for occassional use on a starter or perhaps marine battery where a true 100% recharge is not all that important.
If one refuses to spend the ~150$ for either of these 2 converters, then I would go with the 80$ prologix 2/10/20 amp garage charger I previously linked, and simply learn to not trust its 'full charge' indicator. Learn how to load battery with a big load until voltage falls to 12.6v or less, then restart charger, then remove load. Lather rinse repeating/ tricking the 'smart' charger into restarting, is required for a garage charger to get a hard working abused battery to a true full, and nobody should drive away from 8+ hours of grid power with less than 100% charged batteries.
To be fair, the RV converters can also drop out of way absorption too early as well. the PD can be forced back to 14.4v at the press of a button. the Iota would need to be disconnected from 115vac then reconnected.
A huge advantage of the RVconverter over a garage charger, is one can keep using their DC loads while battery charging. Doing this with a 'smart' garage charger will confuse it and cause it to shut itself off as it thinks something is wrong with the battery.
One other consideration of garage chargers is the alligator clips beat the F out of the battery terminals over time, and are not meant to be left on battery full time, and are a potential source of sparks. If that alligator clamp slips off a battery that is gassing, it could present an ignition danger.
No the RV converters are not sexy, and one has to provide their own DC output cables( The HORROR!!!), but in function, they are superior to any garage charger, no matter how well marketed nor how pleasing its plastic casing and LED displays are to the eyeball.
And for those wanting to recharge fully in the minimal time possible departent, a manual, Adjustable voltage high amp charger/power supply, will win that contest every single time, but it is not automatic. I know it produces heaps of anxiety, but these adjustable voltage power supplies either must be turned off, by a Human with an opposable thumb, or have their voltage reduced, also by a human with an opposable thumb, at the appropriate time. Truly involved rocket science. Beware, and run screaming holding your smartphone taking selfies along the way sharing your horror for all to see.
When one gets sick of having to trick their garage charger into restarting, multiple times, one then wishes their charging source would simply hold absorption voltage for longer, as takes less work, and effort, and time. That is the beauty of an adjustable voltage powersupply Seek and hold absorption voltage.
The only factor is 'How Long'
Well, until amps accepted by the battery at absorption voltage taper to about 2% of capacity(20 hour rate) on a flooded battery, and 0.5% of capacity on a AGM. Requiring an AMMeter. Again, run screaming at this horror toward the product with the lying green light on it, then line up with the other ostriches who are yellng under the sand, that 'float equals full, float equals full.'
