Best NiMH rechargeable is Eneloop and other brands made in Japan by the Fujitsu factory. Best charger is dependent on what you will be using it for. Since I have both NimH and Li-Ion rechargeables, I use a charger that can do both.
I don’t know if you ever go past an Ikea store (Scarborough is miles away from the nearest one which looks like it is probably Leeds) but the Ikea AA/AAA’s are pretty highly regarded and may well be very similar to Eneloop albeit a fair bit cheaper. If you’re on a real budget, the Liitokala Li-100 charger (single bay) or Li-200 (double) can be had for as little as $4 from the likes of Banggood.
Hope that helps.,
You’ll find the people on this forum are really knowledgeable and helpful.
Be sure to buy the white LADDA’s (2500mAh AA) if you want them to be low self discharging, like eneloops.
I like them, but they are a bit too thick fore some of my appliances.
This site has several tests of AA and AAA nihm batteries. If your goal is longevity and high current, then eneloop can not be beat. The lite versions have even better capacity retention with lots (like hundreds) of recharge cycles. If best means highest capacity early in life, then there are better choices. The site referenced has data on standard and high capacity nimh cells also. Check it out!!
For chargers, the site reviews those as well. I personally am fine with my simple Panasonic BQ-CC17 charger. It can charge up to 4 AA or AAA cells in any combination.