Palintest Pooltest 6 may be a better option for you if you want a digital testing device, it's accuracy is far superior to drop kits, and includes a DPD XT test to test chlorine in the 0.01-10.00ppm range, which is good for DPD testing, but is pricey and the cost of replacement reagent tablets is also very high.
Lovibond offers a similarly priced MD200 photometer, with 2 main differences, namely a lack of ability to test above 5ppm Chlorine, however a substantially reduced costing of tablet reagents, however I am not sure of availability of Lovibond products in the US.
The TF100 and Taylor drop kits seem to both offer good value for money on the price of reagents, coupled with the FAS-DPD testing ability to a range of 50ppm, which is good for residential pool owners who need an accurate testing method, the drawback will be the ability of yourself to be able to determine colour change especially with the chlorine test as depending on your level of colour blindness, it may well be impossible to tell the difference when the colour changes from slightly pink to colourless.
For obvious reasons I would not recommend comparators to you, which involve matching colour scales to ascertain a reading.
I think it really comes down to how colour blind you are, could you tell the difference between water that has a pink tinge to it, or not? If you can the TF100 will serve you well, if you can't and your in the market for a good quality photometer - (I do not consider anything Which costs less than $400 a good photometer) and given the chlorine testing constraints of DPD tablet reagents 0-5ppm or DPDXT 0-10ppm, then it may well be for you.
For the record I have a lovibond comparator, a FAS-DPD Palintest drop kit and a Palintest 7100 photometer, so it's fair to say I have experienced a wide range of testing methods, the photometer gives the easiest and most accurate results from all the devices, but is expensive, the drop kit is very good also.
Regards
Stuart