Which is better for fast running?

The Adizero EVO SL. It is far lighter and has a firmer, lower ride that holds up at tempo and race pace. The Ultraboost Light is built for comfort, not speed.

Which is better for beginners or easy daily miles?

The Ultraboost Light. Its softer Light BOOST cushioning and 10 mm drop are more forgiving for new runners and recovery days. The EVO SL rewards a trained, efficient stride.

The Ultraboost Light generally holds up better. Its Continental Better Rubber outsole and thicker foam resist wear, while the EVO SL's thin upper and firm foam suit lighter, faster use.

Is the Adizero EVO SL worth stepping up to?

Yes if you already own a cushioned daily shoe and want a second pair for speed. It is not a replacement for a soft trainer if most of your miles are easy.

Do they fit the same?

No. The EVO SL is a normal-width unisex fit with a thin upper; the Ultraboost Light is a men's regular fit with a stretchy knit that hugs the foot. Try both if you are between sizes.

Can I use either for walking or standing all day?

The Ultraboost Light is the better choice for that. The EVO SL's firm, low foam is tuned for running and feels thin underfoot during long standing.

adidas Adizero EVO SL vs adidas Ultraboost Light

Buy the Adizero EVO SL for fast road running, tempo work and long runs where you want a light, low, neutral ride. Buy the Ultraboost Light for daily training, standing and walking, where the softer, higher stack and padded knit upper feel more forgiving. The EVO SL is the lighter, more responsive shoe and rates very highly with owners; the Ultraboost is the heavier, more cushioned and more durable-feeling all-rounder.

Choose the Adizero EVO SL if you want a light neutral trainer for speed sessions and race-pace miles.
Choose the Ultraboost Light if you want one cushioned shoe for easy runs, the gym and all-day wear.

Prices

adidas Adizero EVO SL: $75.00 at Finish Line (last seen Nov 9)
adidas Ultraboost Light: $49.95 at Amazon (checked today)
Difference: the adidas Ultraboost Light is $25.05 cheaper than the adidas Adizero EVO SL at the latest prices (Nov 9 and Nov 10)